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

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 16期

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.

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页码：2463 / 2466

页数：4

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