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Abstract
It is needed to include the next-nearest hopping for the instability of twodimensional half-filled lattice. Then there exists a critical value δ0 of the dimerization δ. When δ≥δ0, it is part-nesting, a part of Fermi surface is flat; whereas δ＜δ0, it is only approximate nesting, Fermi surface is curved.
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Ling Fan²,

Sun Xin¹
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Cited By

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[20]	LIU JING-NAN, SUN XIN.ELECTRON CORRELATION AND TWO-DIMENSIONAL LATTICE INSTABILITY. Acta Physica Sinica, 1992, 41(1): 80-86.doi:10.7498/aps.41.80

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Vol. 43, Issue 8 - 1994-04-20

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