ON THE CHARGE-EXCITATION GAP OF THE 2D HALF-FILLED HUBBARD-MODEL - A QUANTUM MONTE-CARLO STUDY

被引：2

作者：

CHEN, F ^{[1
]}

YING, HP ^{[1
]}

XU, TF ^{[1
]}

LI, WZ ^{[1
]}

机构：

[1] ZHEJIANG INST MODERN PHYS,HANGZHOU 310027,PEOPLES R CHINA

来源：

PHYSICS LETTERS A | 1994年 / 189卷 / 1-2期

关键词：

D O I：

10.1016/0375-9601(94)90825-7

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using the grand canonical quantum Monte Carlo method, we calculate the double occupancy and the specific heat of the half-filled two-dimensional Hubbard model. The results show that, as the temperature is increased, the electronic structure can hardly be regarded as consisting of two rigid bands, and midgap states are created which reduce the charge-excitation gap.

引用

页码：99 / 102

页数：4

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