PHASE-DIAGRAM OF THE ONE-DIMENSIONAL T-J MODEL FROM VARIATIONAL THEORY

被引：85

作者：

HELLBERG, CS

MELE, EJ

机构：

[1] Department of Physics, University of Pennsylvania, Philadelphia

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.67.2080

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a class of variational wave functions for strongly interacting one-dimensional lattice fermions in which correlations among the particles are specified by a single variational parameter. We find that the wave functions describe the ground-state properties of the one-dimensional t-J model remarkably well over the entire phase diagram in which interaction strength and density are varied. Specifically the wave function describes a Tomonaga-Luttinger liquid at low J/t, a phase-separated state at large J/t, and a stable state with infinite compressibility between these phases at low densities.

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页码：2080 / 2083

页数：4

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