电子关联与二维晶格的不稳定性

ELECTRON CORRELATION AND TWO-DIMENSIONAL LATTICE INSTABILITY

本文从电子相互作用的屏蔽库仑势出发,构造了Wannier函数来计算二维不稳定晶格的能带及电子波函数,用相关基函数理论计算了二维非均匀体系的电子关联函数,由此研究了电子关联对二维晶格不稳定性的影响。结果表明,二维体系与一维体系不同,电子相互作用使晶格二聚化减弱。

Starting from the screened Coulomb electron interaction, the energy band and electron wave function of two-dimensional unstable lattice system are calculated by using the Wannier function. The effect of electron correlation on two-dimensional lattice instability is studied by means of the electron correlation function. Our results show that the electron interaction reduces the two-dimensional lattice dimerization, which is different from the one-dimensional case.