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Abstract

The multi-mode Dicke model, which describes many atoms interacting with the multi-mode photons, has attracted much attention; it not only exhibits rich quantum phases, but also has an important application in quantum information. In this paper, we explore the ground-state properties of the two-mode Dicke model by the Holstein-Primakoff transformation and Boson expansion method, and theoretically predict a new first-order quantum phase transition. In the experiment, this quantum phase transition could be detected by measuring the mean-photon number or the atom population.

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Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11074184, 11275129, 61275211), the Natural Science Foundation of Zhejiang Province, China (Grant No. LY13A040001), and the Scientific Research Fundation of the Education Department of Zhejiang Province, China (Grant No. Y201122352).

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Vol. 63, Issue 13 - 2014-07-05

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