//www.getgobooth.com/ 必威体育下载 daily 15 2024-08-20 10:33:36 apsoffice@iphy.ac.cn apsoffice@iphy.ac.cn 2024-08-20 10:33:36 zh Copyright ©Acta Physica Sinica All Rights Reserved. 京ICP备05002789号-1 Address: PostCode：100190 Phone: 010-82649829，82649241,82649863 Email: apsoffice@iphy.ac.cn Copyright ©Acta Physica Sinica All Rights Reserved apsoffice@iphy.ac.cn 1000-3290 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1057 Author(s): LIU SHEN-QUAN, LU QI-SHAO, WANG QI <br/><p>We have studied the motion law of spiral waves in two-dimensional excitable media. The motion of the wave front of spiral waves is divided into two parts, i.e., those along the tangent and the normal directions, and the motion equations in the two directions are obtained with the help of the perburbation method. When these equations are used to analyse the spiral tip, the basic motion law of the spiral tip and the structures of twisted rings and long twisted chains are obtained. When these equations are used to analyses the wave front and its disturbance, the result not only shows ordinary spiral shapes but also explains the super-spiral and the double-spiral structures.</p> <br/>Acta Physica Sinica. 1998 47(7): 1057-1063. Published 1998-07-20 Author(s): LIU SHEN-QUAN, LU QI-SHAO, WANG QI <br/><p>We have studied the motion law of spiral waves in two-dimensional excitable media. The motion of the wave front of spiral waves is divided into two parts, i.e., those along the tangent and the normal directions, and the motion equations in the two directions are obtained with the help of the perburbation method. When these equations are used to analyse the spiral tip, the basic motion law of the spiral tip and the structures of twisted rings and long twisted chains are obtained. When these equations are used to analyses the wave front and its disturbance, the result not only shows ordinary spiral shapes but also explains the super-spiral and the double-spiral structures.</p> <br/>Acta Physica Sinica. 1998 47(7): 1057-1063. Published 1998-07-20 激发介质中螺旋波的波尖运动 LIU SHEN-QUAN, LU QI-SHAO, WANG QI 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1057-1063. article doi:10.7498/aps.47.1057 10.7498/aps.47.1057 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1057 1057-1063 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1064 Author(s): FAN EN-GUI, ZHANG HONG-QING, LIN GANG <br/><p>It is well known that three kinds of soliton solutions have been found to the nonlinear coupled scatar field equations. In this paper we continue to present five other kinds of exact solutions by using some appropriate function transformations. Applications of these results to other well-known equations in physics are also discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1064-1070. Published 1998-07-20 Author(s): FAN EN-GUI, ZHANG HONG-QING, LIN GANG <br/><p>It is well known that three kinds of soliton solutions have been found to the nonlinear coupled scatar field equations. In this paper we continue to present five other kinds of exact solutions by using some appropriate function transformations. Applications of these results to other well-known equations in physics are also discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1064-1070. Published 1998-07-20 EXACT SOLUTIONS TO THE NONLINEAR COUPLED SCALAR FIELD EQUATIONS FAN EN-GUI, ZHANG HONG-QING, LIN GANG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1064-1070. article doi:10.7498/aps.47.1064 10.7498/aps.47.1064 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1064 1064-1070 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1071 Author(s): DANG LAN-FEN <br/><p>In this paper are discussed the time evolution and squeezed states of a time-depedent oscillator system. We obtain closed formulas for the time evolution of quantum states and the evolution operator of the system by selecting proper Hermitian invariant operator. We derive the condition generating squeezed states and obtain that the drive part does not influence the squeezed states of the system.</p> <br/>Acta Physica Sinica. 1998 47(7): 1071-1077. Published 1998-07-20 Author(s): DANG LAN-FEN <br/><p>In this paper are discussed the time evolution and squeezed states of a time-depedent oscillator system. We obtain closed formulas for the time evolution of quantum states and the evolution operator of the system by selecting proper Hermitian invariant operator. We derive the condition generating squeezed states and obtain that the drive part does not influence the squeezed states of the system.</p> <br/>Acta Physica Sinica. 1998 47(7): 1071-1077. Published 1998-07-20 TIME EVOLUTION AND SQUEEZED STATES OF A TIME-DEPEDENT OSCILLATOR SYSTEM DANG LAN-FEN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1071-1077. article doi:10.7498/aps.47.1071 10.7498/aps.47.1071 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1071 1071-1077 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1078 Author(s): LUO XIAO-SHU, KONG LING-JIANG, QU WAN-LI <br/><p>Finite impulse response digital filter was used to stabilize the unstable periodic orbits (UPO) embedded in a chaotic attractor of differential dynamic system and two-dimensional map; and thus high periodic orbits was controlled. As examples we studied the Lorenz system and Henon map. A preliminary analysis and results of numerical analogy are presented. The advantages of this method are that it does not need to know the linear properities and the periodicity about a UPO or that of the UPO extracted from the chaotic attractor. The choice of control parameter is independent of the controlled chaotic system.</p> <br/>Acta Physica Sinica. 1998 47(7): 1078-1083. Published 1998-07-20 Author(s): LUO XIAO-SHU, KONG LING-JIANG, QU WAN-LI <br/><p>Finite impulse response digital filter was used to stabilize the unstable periodic orbits (UPO) embedded in a chaotic attractor of differential dynamic system and two-dimensional map; and thus high periodic orbits was controlled. As examples we studied the Lorenz system and Henon map. A preliminary analysis and results of numerical analogy are presented. The advantages of this method are that it does not need to know the linear properities and the periodicity about a UPO or that of the UPO extracted from the chaotic attractor. The choice of control parameter is independent of the controlled chaotic system.</p> <br/>Acta Physica Sinica. 1998 47(7): 1078-1083. Published 1998-07-20 USING FINITE IMPULSE RESPONSE DIGITAL FILTER TO CONTROL CHAOS LUO XIAO-SHU, KONG LING-JIANG, QU WAN-LI 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1078-1083. article doi:10.7498/aps.47.1078 10.7498/aps.47.1078 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1078 1078-1083 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1084 Author(s): FAN JIAN-PING, HOU YU-QING, WANG YING-MEI, HE DA-REN, WU SHUN-GUANG <br/><p>This paper reports the experimental evidence for the scaling law of Lyapunov exponent in type V intermittency obtained in an electronic relaxation oscillator. The results are in very good agreement with the numerivcal computations conducted with the theoretical model of the oscillator.</p> <br/>Acta Physica Sinica. 1998 47(7): 1084-1089. Published 1998-07-20 Author(s): FAN JIAN-PING, HOU YU-QING, WANG YING-MEI, HE DA-REN, WU SHUN-GUANG <br/><p>This paper reports the experimental evidence for the scaling law of Lyapunov exponent in type V intermittency obtained in an electronic relaxation oscillator. The results are in very good agreement with the numerivcal computations conducted with the theoretical model of the oscillator.</p> <br/>Acta Physica Sinica. 1998 47(7): 1084-1089. Published 1998-07-20 AN EXPERIMENTAL PROOF FOR THE SCALING LAW OF LYAPUNOV EXPONENT IN TYPE V INTERMITTENCY FAN JIAN-PING, HOU YU-QING, WANG YING-MEI, HE DA-REN, WU SHUN-GUANG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1084-1089. article doi:10.7498/aps.47.1084 10.7498/aps.47.1084 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1084 1084-1089 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1090 Author(s): NIE SHI-QI, LIN SHU-QUAN, HUANG BAO-LIN <br/><p>By applying the definitions of curvilinear coordinate in differential geometry and using the main electron trajectory as the curve axis, the first order and second order paraxial electron trajectory equations in the three-dimensional coordinate system are obtained. Some numerical results of these equations applied to the analysis of an electron-beam scanning flat cathode ray tube are given.</p> <br/>Acta Physica Sinica. 1998 47(7): 1090-1100. Published 1998-07-20 Author(s): NIE SHI-QI, LIN SHU-QUAN, HUANG BAO-LIN <br/><p>By applying the definitions of curvilinear coordinate in differential geometry and using the main electron trajectory as the curve axis, the first order and second order paraxial electron trajectory equations in the three-dimensional coordinate system are obtained. Some numerical results of these equations applied to the analysis of an electron-beam scanning flat cathode ray tube are given.</p> <br/>Acta Physica Sinica. 1998 47(7): 1090-1100. Published 1998-07-20 THE PARAXIAL ELECTRON OPTICS IN THE THREE-DIMENSIONAL CURVILINEAR COORDINATE SYSTEM NIE SHI-QI, LIN SHU-QUAN, HUANG BAO-LIN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1090-1100. article doi:10.7498/aps.47.1090 10.7498/aps.47.1090 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1090 1090-1100 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1101 Author(s): CHANG SHENG-JIANG, LIU YUE, ZHANG WEN-WEI, SHEN JIN-YUAN, ZHAI HONG-CHEN, ZHANG YAN-XIN <br/><p>To avoid the poor performance of the Hopfield model for unequally distributed neuron states and to alleviate the dynamic range constraint of optical system, a clipped model with asymmetric clipping points is proposed. Apart from its easiness for optical implementation, the capacity and capablilty of noisy tolerance are improved greatly, compared with the former clipped model. In addition, a practical encoding method-beam-direction encoding method is proposed to implement the above clipped model. The preliminary experimental results are given.</p> <br/>Acta Physica Sinica. 1998 47(7): 1101-1109. Published 1998-07-20 Author(s): CHANG SHENG-JIANG, LIU YUE, ZHANG WEN-WEI, SHEN JIN-YUAN, ZHAI HONG-CHEN, ZHANG YAN-XIN <br/><p>To avoid the poor performance of the Hopfield model for unequally distributed neuron states and to alleviate the dynamic range constraint of optical system, a clipped model with asymmetric clipping points is proposed. Apart from its easiness for optical implementation, the capacity and capablilty of noisy tolerance are improved greatly, compared with the former clipped model. In addition, a practical encoding method-beam-direction encoding method is proposed to implement the above clipped model. The preliminary experimental results are given.</p> <br/>Acta Physica Sinica. 1998 47(7): 1101-1109. Published 1998-07-20 A NEURAL NETWORK MODEL FOR UNEQUALLY DISTRIBUTED NEURON STATES AND ITS OPTICAL IMPLEMENTATION CHANG SHENG-JIANG, LIU YUE, ZHANG WEN-WEI, SHEN JIN-YUAN, ZHAI HONG-CHEN, ZHANG YAN-XIN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1101-1109. article doi:10.7498/aps.47.1101 10.7498/aps.47.1101 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1101 1101-1109 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1110 Author(s): Lv YA-JUN, WU LING-AN, WU MEI-JUAN, LI SHI-QUN, ZHANG PEI-LIN <br/><p>We study the quantum correlation between the signal and pump modes in forward three-wave mixing in media with an intensity-dependent index of refraction, by adopting the semiclassical and the full-quantum theories. Strong positive correlation exists between the two signal modes, but there is strong anti-correlation between the signal modes and the pump. In the semiclassical model, the phase mismatched cases are investigated. In the full-quantum analysis, the effects of the pump quantization and losses are considered.</p> <br/>Acta Physica Sinica. 1998 47(7): 1110-1117. Published 1998-07-20 Author(s): Lv YA-JUN, WU LING-AN, WU MEI-JUAN, LI SHI-QUN, ZHANG PEI-LIN <br/><p>We study the quantum correlation between the signal and pump modes in forward three-wave mixing in media with an intensity-dependent index of refraction, by adopting the semiclassical and the full-quantum theories. Strong positive correlation exists between the two signal modes, but there is strong anti-correlation between the signal modes and the pump. In the semiclassical model, the phase mismatched cases are investigated. In the full-quantum analysis, the effects of the pump quantization and losses are considered.</p> <br/>Acta Physica Sinica. 1998 47(7): 1110-1117. Published 1998-07-20 QUANTUM CORRELATION IN FORWARD THREE-WAVE MIXING Lv YA-JUN, WU LING-AN, WU MEI-JUAN, LI SHI-QUN, ZHANG PEI-LIN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1110-1117. article doi:10.7498/aps.47.1110 10.7498/aps.47.1110 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1110 1110-1117 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1118 Author(s): LIU SHENG-XIA <br/><p>A new mass resolving neutral particle analyzer was installed on the HT-7 tokamak.The analyzer is constructed with electric and magnetic fields and is calibrated over an energy range of 0.2—50keV.The new analyzer provides a wide energy range,mass resolving,perpendicular scanning charge-exchange diagnostic.In Ohmic-heated deuterium discharges,the analyzer provides the measurement of deuterium ion temperature over a range of viewing angles,and radial ion temperature profiles can be obtained.</p> <br/>Acta Physica Sinica. 1998 47(7): 1118-1122. Published 1998-07-20 Author(s): LIU SHENG-XIA <br/><p>A new mass resolving neutral particle analyzer was installed on the HT-7 tokamak.The analyzer is constructed with electric and magnetic fields and is calibrated over an energy range of 0.2—50keV.The new analyzer provides a wide energy range,mass resolving,perpendicular scanning charge-exchange diagnostic.In Ohmic-heated deuterium discharges,the analyzer provides the measurement of deuterium ion temperature over a range of viewing angles,and radial ion temperature profiles can be obtained.</p> <br/>Acta Physica Sinica. 1998 47(7): 1118-1122. Published 1998-07-20 MASS RESOLVING CHARGE-EXCHANGE NEUTRAL PARTICLE MEASUREMENT ON HT-7 TOKAMAK LIU SHENG-XIA 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1118-1122. article doi:10.7498/aps.47.1118 10.7498/aps.47.1118 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1118 1118-1122 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1123 Author(s): ZENG GUI-HUA, XU ZHI-ZHAN <br/><p>The propagation of ultra-intense short laser pulse in uniform underdense plasma has been investigated.The evolution equation and the nonlinear envelope equation were derived.Based on these derived equations,the characteristics of the relativistic harmonics saturation and the laser envelope evolution are discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1123-1129. Published 1998-07-20 Author(s): ZENG GUI-HUA, XU ZHI-ZHAN <br/><p>The propagation of ultra-intense short laser pulse in uniform underdense plasma has been investigated.The evolution equation and the nonlinear envelope equation were derived.Based on these derived equations,the characteristics of the relativistic harmonics saturation and the laser envelope evolution are discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1123-1129. Published 1998-07-20 EVOLUTION OF ULTRA-INTENSE LASER FIELD IN PLASMA ZENG GUI-HUA, XU ZHI-ZHAN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1123-1129. article doi:10.7498/aps.47.1123 10.7498/aps.47.1123 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1123 1123-1129 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1130 Author(s): ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG <br/><p>The electromagnetic field distribution of ion cyclotron wave in tokamak geometry is discussed in detail in this paper.As for the problem that conventional antenna coupling slab model gives larger error to the calculation of large aperture antenna,an improved model is presented that can upgrade the calculation precision greatly.The theoretically computed results are in good agreement with the experimental observation.</p> <br/>Acta Physica Sinica. 1998 47(7): 1130-1136. Published 1998-07-20 Author(s): ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG <br/><p>The electromagnetic field distribution of ion cyclotron wave in tokamak geometry is discussed in detail in this paper.As for the problem that conventional antenna coupling slab model gives larger error to the calculation of large aperture antenna,an improved model is presented that can upgrade the calculation precision greatly.The theoretically computed results are in good agreement with the experimental observation.</p> <br/>Acta Physica Sinica. 1998 47(7): 1130-1136. Published 1998-07-20 AN IMPROVED MODEL OF COUPLE CALCULATION OF ION CYCLOTRON WAVE HEATING ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1130-1136. article doi:10.7498/aps.47.1130 10.7498/aps.47.1130 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1130 1130-1136 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1137 Author(s): ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG <br/><p>The standard normal distribution for particles in tokamak geometry is usually assumed in fast wave heating.In fact,due to the quasi-linear diffusion effect,the parallel and vertical temperatures of the resonant particles are not equal to each other,so,this will bring some error.For this case,the Fokker-Planck equation is introduced in this paper,and iteration algorithm is adopted to solve the problem well.</p> <br/>Acta Physica Sinica. 1998 47(7): 1137-1142. Published 1998-07-20 Author(s): ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG <br/><p>The standard normal distribution for particles in tokamak geometry is usually assumed in fast wave heating.In fact,due to the quasi-linear diffusion effect,the parallel and vertical temperatures of the resonant particles are not equal to each other,so,this will bring some error.For this case,the Fokker-Planck equation is introduced in this paper,and iteration algorithm is adopted to solve the problem well.</p> <br/>Acta Physica Sinica. 1998 47(7): 1137-1142. Published 1998-07-20 FOKKER-PLANCK EQUATION IN THE APPLICATION OF FAST WAVE HEATING ZHU XUE-GUANG, KUANG GUANG-LI, ZHAO YAN-PING, LI YOU-YI, XIE JI-KANG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1137-1142. article doi:10.7498/aps.47.1137 10.7498/aps.47.1137 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1137 1137-1142 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1143 Author(s): CHU GANG <br/><p>A new approach for quantitative X-ray diffraction phase analysis of a powder mixture has been developed using the doping method proposed by Popovic.Two cases of known and unknown mass absorption coefficients of amorphous materials are discussed.The weight fraction of amorphous material or unidentified phases can be obtained by this method.For the determination of multicomponent system containing n phases,in which (n-2) pure phases are deliberately added,the weight fractions of all n phases can be determined.The procedure has been tested by using four-to five-component samples,the analysis results agree well with the theory.</p> <br/>Acta Physica Sinica. 1998 47(7): 1143-1148. Published 1998-07-20 Author(s): CHU GANG <br/><p>A new approach for quantitative X-ray diffraction phase analysis of a powder mixture has been developed using the doping method proposed by Popovic.Two cases of known and unknown mass absorption coefficients of amorphous materials are discussed.The weight fraction of amorphous material or unidentified phases can be obtained by this method.For the determination of multicomponent system containing n phases,in which (n-2) pure phases are deliberately added,the weight fractions of all n phases can be determined.The procedure has been tested by using four-to five-component samples,the analysis results agree well with the theory.</p> <br/>Acta Physica Sinica. 1998 47(7): 1143-1148. Published 1998-07-20 A DOPING METHOD FOR QUANTITATIVE X-RAY DIFFRACTION PHASE ANALYSIS OF SAMPLES CONTAINING AMORPHOUS MATERIAL CHU GANG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1143-1148. article doi:10.7498/aps.47.1143 10.7498/aps.47.1143 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1143 1143-1148 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1149 Author(s): WANG WEI-HUA, BAI HAI-YANG, WANG WEN-KUI <br/><p>Solid state amorphization reaction process in Ni/amorphous Si multilayers has been quanlitatively studied by using in situ X-ray diffraction. An amorphous formation and growth model is suggested for elucidating the solid state reaction in the Ni/amorphous Si multilayers. Thermodynamic and kinetic interpretations for the amorphization reaction at grain boundaries in Ni sublayers are presented.</p> <br/>Acta Physica Sinica. 1998 47(7): 1149-1154. Published 1998-07-20 Author(s): WANG WEI-HUA, BAI HAI-YANG, WANG WEN-KUI <br/><p>Solid state amorphization reaction process in Ni/amorphous Si multilayers has been quanlitatively studied by using in situ X-ray diffraction. An amorphous formation and growth model is suggested for elucidating the solid state reaction in the Ni/amorphous Si multilayers. Thermodynamic and kinetic interpretations for the amorphization reaction at grain boundaries in Ni sublayers are presented.</p> <br/>Acta Physica Sinica. 1998 47(7): 1149-1154. Published 1998-07-20 AMORPHIZATION REACTION PROCESS IN Ni/AMORPHOUS Si MULTILAYER WANG WEI-HUA, BAI HAI-YANG, WANG WEN-KUI 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1149-1154. article doi:10.7498/aps.47.1149 10.7498/aps.47.1149 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1149 1149-1154 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1155 Author(s): MENG XIAN, WANG YOU-NIAN <br/><p>The wake potential and energy loss of a swift ion moving parallel to a heavily doped semiconductor surface in vacuum are studied with the specular-reflection model and the dielectric response theory. The phonon-electron coupling effect on the surface wake potential and the energy loss is investigated by using a frequency-dependent dielectric function. We find that there are two branches of phonon-electron coupling excitations which contribute to the wake potential and the energy loss. Numerical results show that the oscillation form of the wake potential is obviously influenced by the phonon-electron coupling effect.</p> <br/>Acta Physica Sinica. 1998 47(7): 1155-1160. Published 1998-07-20 Author(s): MENG XIAN, WANG YOU-NIAN <br/><p>The wake potential and energy loss of a swift ion moving parallel to a heavily doped semiconductor surface in vacuum are studied with the specular-reflection model and the dielectric response theory. The phonon-electron coupling effect on the surface wake potential and the energy loss is investigated by using a frequency-dependent dielectric function. We find that there are two branches of phonon-electron coupling excitations which contribute to the wake potential and the energy loss. Numerical results show that the oscillation form of the wake potential is obviously influenced by the phonon-electron coupling effect.</p> <br/>Acta Physica Sinica. 1998 47(7): 1155-1160. Published 1998-07-20 EFFECT OF PHONON-ELECTRON COUPLING ON THE SURFACE WAKE POTENTIAL MENG XIAN, WANG YOU-NIAN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1155-1160. article doi:10.7498/aps.47.1155 10.7498/aps.47.1155 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1155 1155-1160 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1161 Author(s): HAN FU-SHENG, ZHU ZHEN-GANG, SHI CHUN-YI, WANG YUE <br/><p>Internal friction measurements have been performed at the different frequencies, temperatures and strain amplitudes to examine the damping characteristics of foamed aluminum. It is found that the pores contribute to the damping by raising the internal friction background, particularly the high temperature one. The other significant feature is that the internal friction is strain-amplitude-dependent, which becomes more obvious as the pore size decreases. There are inhomogeneous pores and high density of defects in the structure, leading to nonuniformly distributed stress and strain. This state will be intensified under the disturbance of applied load, making the defect density increase. The defect effects are therefore responsible for the damping characteristics of foamed aluminum.</p> <br/>Acta Physica Sinica. 1998 47(7): 1161-1170. Published 1998-07-20 Author(s): HAN FU-SHENG, ZHU ZHEN-GANG, SHI CHUN-YI, WANG YUE <br/><p>Internal friction measurements have been performed at the different frequencies, temperatures and strain amplitudes to examine the damping characteristics of foamed aluminum. It is found that the pores contribute to the damping by raising the internal friction background, particularly the high temperature one. The other significant feature is that the internal friction is strain-amplitude-dependent, which becomes more obvious as the pore size decreases. There are inhomogeneous pores and high density of defects in the structure, leading to nonuniformly distributed stress and strain. This state will be intensified under the disturbance of applied load, making the defect density increase. The defect effects are therefore responsible for the damping characteristics of foamed aluminum.</p> <br/>Acta Physica Sinica. 1998 47(7): 1161-1170. Published 1998-07-20 STUDY ON THE DAMPING CHARACTERISTICS OF FOAMED ALUMINUM HAN FU-SHENG, ZHU ZHEN-GANG, SHI CHUN-YI, WANG YUE 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1161-1170. article doi:10.7498/aps.47.1161 10.7498/aps.47.1161 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1161 1161-1170 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1171 Author(s): LIN FENG, SHENG CHI, KE LIAN, ZHU JIAN-HONG, GONG DA-WEI, ZHANG SHENG-KUN, YU MIN-FENG, FAN YONG-LIANG, WANG XUN <br/><p>The admittance spectroscopy technique has been used to study the hole confinement in Si/Si1-xGex/Si and boron highly doped superthin Si quantum wells. Based on the carrier thermal emission medel of the carriers in the well, the value of activation energy derived from the admittance spectra was considered as the distance from the position of the heavy hole ground state in the well to the top of it . For Si/Si1-xGex/Si quantum wells we found the value of activation energy increased with increasing annealing time at 800℃. The phenomena could be explained the annealing-induced interdiffusion of Si and Ge, the interface broadening, the weakening of quantum confinement, the decrease of the position of the heavy hole ground state, and so the increase of the activation energy. At the annealing temperature of 900℃, we only see the decrease of the value of activation energy with increasing annealing time. For boron highly doped superthin Si quantum wells due to quantum confinement effect, we observed the activation energy are different for samples with the same doping density but different well widths.</p> <br/>Acta Physica Sinica. 1998 47(7): 1171-1179. Published 1998-07-20 Author(s): LIN FENG, SHENG CHI, KE LIAN, ZHU JIAN-HONG, GONG DA-WEI, ZHANG SHENG-KUN, YU MIN-FENG, FAN YONG-LIANG, WANG XUN <br/><p>The admittance spectroscopy technique has been used to study the hole confinement in Si/Si1-xGex/Si and boron highly doped superthin Si quantum wells. Based on the carrier thermal emission medel of the carriers in the well, the value of activation energy derived from the admittance spectra was considered as the distance from the position of the heavy hole ground state in the well to the top of it . For Si/Si1-xGex/Si quantum wells we found the value of activation energy increased with increasing annealing time at 800℃. The phenomena could be explained the annealing-induced interdiffusion of Si and Ge, the interface broadening, the weakening of quantum confinement, the decrease of the position of the heavy hole ground state, and so the increase of the activation energy. At the annealing temperature of 900℃, we only see the decrease of the value of activation energy with increasing annealing time. For boron highly doped superthin Si quantum wells due to quantum confinement effect, we observed the activation energy are different for samples with the same doping density but different well widths.</p> <br/>Acta Physica Sinica. 1998 47(7): 1171-1179. Published 1998-07-20 GROUND STATE ENERGY LEVEL OF Si-BASE QUANTUM WELLS DETECTED BY ADMITTANCE SPECTROSCOPY LIN FENG, SHENG CHI, KE LIAN, ZHU JIAN-HONG, GONG DA-WEI, ZHANG SHENG-KUN, YU MIN-FENG, FAN YONG-LIANG, WANG XUN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1171-1179. article doi:10.7498/aps.47.1171 10.7498/aps.47.1171 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1171 1171-1179 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1180 Author(s): CHEN YI-QIAO, LEI XIAO-LIN <br/><p>We present a theoretical study of quasi-classical transport of two-dimensional Bloch electrons under the influence of an electric and a magnetic fields, starting respectively from the quasi-classical equation of motion of electrons and from the balance equations proposed by one of the authors. The electron longitudinal velocity vx and the Hall drift velocity vy are calculated as functions of the magnetic field under different strengths of the applied electric field. It is shown that both vx and vy always change continuously with variation of magnetic field. No sudden jump in the vx-B or the vy-B curve has been found at any given electric field, in contradiction with the claim made in a recent paper published in Acta Physica Sinica (vol. 46). The possible cause for this disagreement is discussed. Furthermore, we point out that the validity of the naive way to study electron transport by directly introducing a damping force into the quasi-classical equation of motion of electron is quite limited.</p> <br/>Acta Physica Sinica. 1998 47(7): 1180-1186. Published 1998-07-20 Author(s): CHEN YI-QIAO, LEI XIAO-LIN <br/><p>We present a theoretical study of quasi-classical transport of two-dimensional Bloch electrons under the influence of an electric and a magnetic fields, starting respectively from the quasi-classical equation of motion of electrons and from the balance equations proposed by one of the authors. The electron longitudinal velocity vx and the Hall drift velocity vy are calculated as functions of the magnetic field under different strengths of the applied electric field. It is shown that both vx and vy always change continuously with variation of magnetic field. No sudden jump in the vx-B or the vy-B curve has been found at any given electric field, in contradiction with the claim made in a recent paper published in Acta Physica Sinica (vol. 46). The possible cause for this disagreement is discussed. Furthermore, we point out that the validity of the naive way to study electron transport by directly introducing a damping force into the quasi-classical equation of motion of electron is quite limited.</p> <br/>Acta Physica Sinica. 1998 47(7): 1180-1186. Published 1998-07-20 QUASI-CLASSICAL TRANSPORT OF TWO-DIMENSIONAL BLOCH ELECTRONS UNDER ELECTRIC AND MAGNETIC FIELDS CHEN YI-QIAO, LEI XIAO-LIN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1180-1186. article doi:10.7498/aps.47.1180 10.7498/aps.47.1180 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1180 1180-1186 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1187 Author(s): WANG JI-SUO, HAN BAO-CUN, SUN CHANG-YONG <br/><p>Starting from the equation for the classical motion of a nondissipative mesoscopic capacitance coupled circuits with source,we have studied the quantum fluctuations of the charge and current in the eigenstate of the coupled circuits and in the squeezed vacuum state,respectively.The results show that the quantum fluctuations in the two circuits are correlated with each other.</p> <br/>Acta Physica Sinica. 1998 47(7): 1187-1192. Published 1998-07-20 Author(s): WANG JI-SUO, HAN BAO-CUN, SUN CHANG-YONG <br/><p>Starting from the equation for the classical motion of a nondissipative mesoscopic capacitance coupled circuits with source,we have studied the quantum fluctuations of the charge and current in the eigenstate of the coupled circuits and in the squeezed vacuum state,respectively.The results show that the quantum fluctuations in the two circuits are correlated with each other.</p> <br/>Acta Physica Sinica. 1998 47(7): 1187-1192. Published 1998-07-20 QUANTUM FLUCTUATIONS IN MESOSCOPIC CAPACITANCE COUPLED CIRCUITS WANG JI-SUO, HAN BAO-CUN, SUN CHANG-YONG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1187-1192. article doi:10.7498/aps.47.1187 10.7498/aps.47.1187 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1187 1187-1192 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1193 Author(s): CHENG RONG-SHENG, LI KE-BIN, LI XI-JUN, CHEN ZHI-XIANG, XIONG CAO-SHUI, ZHU JING-SHENG, ZHANG YU-HENG <br/><p>A series of La0.67Ca0.33MnO3/(La0.35Nd0.65)2/3Ca1/3MnO3/La0.67Ca0.33MnO3(termed as LCMO/LNCMO/LCMO) epitaxial trilayered films, in which LNCMO under zero magnetic field exhibits semiconductor-like conducting behavior down to 4.2K, have been fabricated on SrTiO3(001) substrates by d.c. magnetron sputtering technique. The measurements of resistance show that transport properties of the trilayered films are clearly different from that of the pure LNCMO or LCMO films. In the LCMO(75nm)/LNCMO(450nm)/LCMO(75nm)film, two resistance peaks have been observed. With the measurements of magnetic hysteresis loop, it show that there may exist a magnetic exchange-coupling interaction and an intra-magnetic field in the trilayered film. When the external magnetic field is applied, the resistance decreases and the resistance peak shifts to higher temperature, therefore it appears colossal magnetoresistance effect. Compared with the magnetoresistance response in pure LCMO film, the enhanced magnetoresistance effect have been observed in these trilayed films, and it maintains a stronger magnetoresistance effect in a wide temperature range. We suggest it results from the middle layer LNCMO in the trilayered film.</p> <br/>Acta Physica Sinica. 1998 47(7): 1193-1200. Published 1998-07-20 Author(s): CHENG RONG-SHENG, LI KE-BIN, LI XI-JUN, CHEN ZHI-XIANG, XIONG CAO-SHUI, ZHU JING-SHENG, ZHANG YU-HENG <br/><p>A series of La0.67Ca0.33MnO3/(La0.35Nd0.65)2/3Ca1/3MnO3/La0.67Ca0.33MnO3(termed as LCMO/LNCMO/LCMO) epitaxial trilayered films, in which LNCMO under zero magnetic field exhibits semiconductor-like conducting behavior down to 4.2K, have been fabricated on SrTiO3(001) substrates by d.c. magnetron sputtering technique. The measurements of resistance show that transport properties of the trilayered films are clearly different from that of the pure LNCMO or LCMO films. In the LCMO(75nm)/LNCMO(450nm)/LCMO(75nm)film, two resistance peaks have been observed. With the measurements of magnetic hysteresis loop, it show that there may exist a magnetic exchange-coupling interaction and an intra-magnetic field in the trilayered film. When the external magnetic field is applied, the resistance decreases and the resistance peak shifts to higher temperature, therefore it appears colossal magnetoresistance effect. Compared with the magnetoresistance response in pure LCMO film, the enhanced magnetoresistance effect have been observed in these trilayed films, and it maintains a stronger magnetoresistance effect in a wide temperature range. We suggest it results from the middle layer LNCMO in the trilayered film.</p> <br/>Acta Physica Sinica. 1998 47(7): 1193-1200. Published 1998-07-20 ENHANCED MAGNETORESISTIVE EFFECT IN TRILAYERED FILMS OF LaCaMnO/LaNdCaMnO/LaCaMnO CHENG RONG-SHENG, LI KE-BIN, LI XI-JUN, CHEN ZHI-XIANG, XIONG CAO-SHUI, ZHU JING-SHENG, ZHANG YU-HENG 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1193-1200. article doi:10.7498/aps.47.1193 10.7498/aps.47.1193 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1193 1193-1200 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1201 Author(s): LEI HONG-BING, YANG QIN-QING, WANG QI-MING <br/><p>Rare earth element of erbium implanted into silicon was studied by photoluminescence,and nine spectral lines were observed.The analysis of the symmetry of crystal field shows that the nine spectral lines come from the crystal-field splitting of the transition 4I13/2→4I15/2.We concludethat the symmetry of the two low-energy excited (initial) state levels,in order of increasing energy,are Γ8 and Γ6, from which to the splitting state levels of 4I15/2 nine radiative transitions are allowed.Oxygen codopants can increase greatly the PL intensity of Er3+, but the spectral features are similar,indicating oxygen codopants can enhance the intensity of Td crystal field rather than change the Td symmetry of the crystal field on the Er3+ sites.</p> <br/>Acta Physica Sinica. 1998 47(7): 1201-1206. Published 1998-07-20 Author(s): LEI HONG-BING, YANG QIN-QING, WANG QI-MING <br/><p>Rare earth element of erbium implanted into silicon was studied by photoluminescence,and nine spectral lines were observed.The analysis of the symmetry of crystal field shows that the nine spectral lines come from the crystal-field splitting of the transition 4I13/2→4I15/2.We concludethat the symmetry of the two low-energy excited (initial) state levels,in order of increasing energy,are Γ8 and Γ6, from which to the splitting state levels of 4I15/2 nine radiative transitions are allowed.Oxygen codopants can increase greatly the PL intensity of Er3+, but the spectral features are similar,indicating oxygen codopants can enhance the intensity of Td crystal field rather than change the Td symmetry of the crystal field on the Er3+ sites.</p> <br/>Acta Physica Sinica. 1998 47(7): 1201-1206. Published 1998-07-20 CRYSTAL-FIELD SPLITTING OF Er3+ IN SILICON LEI HONG-BING, YANG QIN-QING, WANG QI-MING 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1201-1206. article doi:10.7498/aps.47.1201 10.7498/aps.47.1201 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1201 1201-1206 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1207 Author(s): YIN MIN, LOU LI-REN, ZHANG WEI-PING, XIA SHANG-DA, J.C.KRUPA <br/><p>Nanometric Scale X1-Y2SiO5∶Eu was prepared by sol-gel method with particle size about 50nm.The optical properties of the sample were investigated.Its luminescence spectra were recorded at room temperature and 15K using site selective excitation by a dye laser in addition to conventional UV excitation.Site selective excitation gave two sites for the Eu3+ ion in X1-Y2SiO5.These two sites differ significantly from each other as stated by their emission spectra.Wavelengths of the 5D0→7F0—4 transitions of the two sites were tabulated.Lifetimes of the 5D0 energy level were also measured. They are 3.00ms (site 1) and 2.18ms (site 2).</p> <br/>Acta Physica Sinica. 1998 47(7): 1207-1212. Published 1998-07-20 Author(s): YIN MIN, LOU LI-REN, ZHANG WEI-PING, XIA SHANG-DA, J.C.KRUPA <br/><p>Nanometric Scale X1-Y2SiO5∶Eu was prepared by sol-gel method with particle size about 50nm.The optical properties of the sample were investigated.Its luminescence spectra were recorded at room temperature and 15K using site selective excitation by a dye laser in addition to conventional UV excitation.Site selective excitation gave two sites for the Eu3+ ion in X1-Y2SiO5.These two sites differ significantly from each other as stated by their emission spectra.Wavelengths of the 5D0→7F0—4 transitions of the two sites were tabulated.Lifetimes of the 5D0 energy level were also measured. They are 3.00ms (site 1) and 2.18ms (site 2).</p> <br/>Acta Physica Sinica. 1998 47(7): 1207-1212. Published 1998-07-20 PREPARATION AND SITE SELECTIVELY EXCITED LUMINESCENCE OF NANOMETRIC SCALE X1-Y2SiO5∶Eu YIN MIN, LOU LI-REN, ZHANG WEI-PING, XIA SHANG-DA, J.C.KRUPA 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1207-1212. article doi:10.7498/aps.47.1207 10.7498/aps.47.1207 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1207 1207-1212 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1213 Author(s): LIU GONG-QIANG, C.S.TSAI <br/><p>A theoretical Treatment is presented on the propagation characteristics of magnetostatic forward volume waves and related guided-wave magnetooptic (MO) Bragg diffraction in an YIG-GGG waveguide under an inclined bias magnetic field.It is found that,in contrast to the usual situation of a perpendicular bias magnetic field,an inclined bias magnetic field leads to the modification to the phase matching condition and,as a result of increased Faraday effect etc.,facilitates enhancement of MO Bragg diffraction efficiency.Such an efficiency enhancement enables utilization of low-propagation loss materials such as the pure YIG for construction of viable guided-wave MO Bragg devices.The theoretical predictions are in good agreement with the experimental results.</p> <br/>Acta Physica Sinica. 1998 47(7): 1213-1221. Published 1998-07-20 Author(s): LIU GONG-QIANG, C.S.TSAI <br/><p>A theoretical Treatment is presented on the propagation characteristics of magnetostatic forward volume waves and related guided-wave magnetooptic (MO) Bragg diffraction in an YIG-GGG waveguide under an inclined bias magnetic field.It is found that,in contrast to the usual situation of a perpendicular bias magnetic field,an inclined bias magnetic field leads to the modification to the phase matching condition and,as a result of increased Faraday effect etc.,facilitates enhancement of MO Bragg diffraction efficiency.Such an efficiency enhancement enables utilization of low-propagation loss materials such as the pure YIG for construction of viable guided-wave MO Bragg devices.The theoretical predictions are in good agreement with the experimental results.</p> <br/>Acta Physica Sinica. 1998 47(7): 1213-1221. Published 1998-07-20 THEORY OF GUIDED-WAVE MAGNETOOPTIC BRAGG DIFFRACTION IN YIG-GGG WAVEGUIDE UNDER INCLINED BIAS MAGNETIC FIELD LIU GONG-QIANG, C.S.TSAI 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1213-1221. article doi:10.7498/aps.47.1213 10.7498/aps.47.1213 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1213 1213-1221 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1222 Author(s): YANG PING-XIONG, DENG HONG-MEI, CHU JUN-HAO <br/><p>The characterization of Nb-doped layered perovskite SrBi2Ta2O9 was studied.The mechanism of modification of properties was analyzed.Photoacoustic spectroscopy has been used to study the light absorption of SrBi2Ta2O9 with various Nb contents.The results show that the absorption band at 580nm in the photoacoustic spectroscopy exhibits a red shift with increasing niobium content.The remanent polarization of Nb-doped SrBi2Ta2O9 films depends on the concentration ratio of Ta/Nb.The remanent polarization of the films arose an maximum at the area of Ta/Nb≈1.This may be related to the existence of morphotropic phase boundary.</p> <br/>Acta Physica Sinica. 1998 47(7): 1222-1228. Published 1998-07-20 Author(s): YANG PING-XIONG, DENG HONG-MEI, CHU JUN-HAO <br/><p>The characterization of Nb-doped layered perovskite SrBi2Ta2O9 was studied.The mechanism of modification of properties was analyzed.Photoacoustic spectroscopy has been used to study the light absorption of SrBi2Ta2O9 with various Nb contents.The results show that the absorption band at 580nm in the photoacoustic spectroscopy exhibits a red shift with increasing niobium content.The remanent polarization of Nb-doped SrBi2Ta2O9 films depends on the concentration ratio of Ta/Nb.The remanent polarization of the films arose an maximum at the area of Ta/Nb≈1.This may be related to the existence of morphotropic phase boundary.</p> <br/>Acta Physica Sinica. 1998 47(7): 1222-1228. Published 1998-07-20 DOPING CHARACTERIZATION STUDIES OF LAYERED PEROVSKITE SrBi2Ta2O9 FERROELECTRIC THIN FILMS YANG PING-XIONG, DENG HONG-MEI, CHU JUN-HAO 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1222-1228. article doi:10.7498/aps.47.1222 10.7498/aps.47.1222 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1222 1222-1228 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1229 Author(s): MA LI-PING, YANG WEN-JUN, XUE ZENG-QUAN, CHEN HUI-YING, PANG SHI-JIN <br/><p>Crystalline organic complex thin films have been performed by vacuum evaporation method on HOPG substrates.Using Scanning Tunneling Microscope storage,array has been made on the film by applying voltage pulses between the tip and the substrate.The recording marks are 1.3nm in diameter.Voltage-current characterization shows that the recorded region has a conductor behavior while the unrecorded regions shows an insulator behavior.It is confirmed from experiments that the distance between two recording marks can be as short as 2nm,which corresponds to the storage density of 2.5×1013bit/cm2.The mechanism about the recording is briefly discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1229-1232. Published 1998-07-20 Author(s): MA LI-PING, YANG WEN-JUN, XUE ZENG-QUAN, CHEN HUI-YING, PANG SHI-JIN <br/><p>Crystalline organic complex thin films have been performed by vacuum evaporation method on HOPG substrates.Using Scanning Tunneling Microscope storage,array has been made on the film by applying voltage pulses between the tip and the substrate.The recording marks are 1.3nm in diameter.Voltage-current characterization shows that the recorded region has a conductor behavior while the unrecorded regions shows an insulator behavior.It is confirmed from experiments that the distance between two recording marks can be as short as 2nm,which corresponds to the storage density of 2.5×1013bit/cm2.The mechanism about the recording is briefly discussed.</p> <br/>Acta Physica Sinica. 1998 47(7): 1229-1232. Published 1998-07-20 STUDY OF ULTRAHIGH DENSITY DATA STORAGE ON ORGANIC-COMPLEX THIN FILMS MA LI-PING, YANG WEN-JUN, XUE ZENG-QUAN, CHEN HUI-YING, PANG SHI-JIN 1998-07-20 Personal use only, all commercial or other reuse prohibited Acta Physica Sinica. 1998 47(7): 1229-1232. article doi:10.7498/aps.47.1229 10.7498/aps.47.1229 Acta Physica Sinica 47 7 1998-07-20 //www.getgobooth.com/en/article/doi/10.7498/aps.47.1229 1229-1232

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