GAPS IN DENSITIES OF STATES OF 2 HUBBARD-LIKE MODELS

被引:17
作者
DEVRIES, P
MICHIELSEN, K
DERAEDT, H
机构
[1] Institute for Theoretical Physics, University of Groningen, NL-9747 AG Groningen
关键词
D O I
10.1103/PhysRevLett.70.2463
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Results are presented for the single-particle density of states of the one- and two-dimensional simplified Hubbard and Montorsi-Rasetti model. The former does not exhibit a metal-insulator transition as a function of U. With increasing temperature and for U not too large, the gap closes and spectral weight appears at the chemical potential. The Neel temperature and the temperature range for coexistence of magnetic long-range order and a gapless density of states are determined. The latter model exhibits a metal-insulator transition of the Mott type and does not show magnetic long-range order.
引用
收藏
页码:2463 / 2466
页数:4
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