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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.
Authors and contacts
Ling Fan²,

Sun Xin¹

(1)复旦大学物理系; (2)扬州师范学院物理系
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