GROUND-STATE OF THE HUBBARD-MODEL - A VARIATIONAL APPROACH BASED ON THE MAXIMUM-ENTROPY PRINCIPLE

被引：13

作者：

ARRACHEA, L ^{[1
]}

CANOSA, N ^{[1
]}

PLASTINO, A ^{[1
]}

ROSSIGNOLI, R ^{[1
]}

机构：

[1] TECH UNIV MUNICH, DEPT PHYS, W-8046 GARCHING, GERMANY

来源：

PHYSICS LETTERS A | 1993年 / 176卷 / 05期

关键词：

D O I：

10.1016/0375-9601(93)90932-P

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A variational approach based on maximum entropy considerations is used to approximate the ground state of the Hubbard Hamiltonian. The evaluation of both the ground state energy and the correlation functions is performed with a trial wave function, which is parameterized in terms of a small set of variables associated with the relevant correlation operators of the problem. Results for the one-dimensional case are in very good agreement with the exact ones for arbitrary interaction strengths. It is also shown that the method provides us with better evaluations of the ground state energy and correlation functions than those obtained with the Gutzwiller approximation.

引用

页码：353 / 359

页数：7

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