VARIATIONAL STUDY OF A SIMPLE-MODEL FOR BIPOLARONS

被引：11

作者：

LO, CF ^{[1
]}

SOLLIE, R ^{[1
]}

机构：

[1] FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.45.7102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper we have generalized the variational approach proposed by Zheng [Solid State Commun. 65, 731 (1988)] and applied it to a simple model for bipolarons. We have introduced a new trial state with both variable displacement and squeezing. With optimal values of the variational displacement and squeezing parameters, this trial state will by construction yield an energy lower than that obtained by Zheng. This means that our variational ansatz is more stable as the ground state of the system. Also, in this approximate ground state the reduction effect of phonons is further alleviated.

引用

页码：7102 / 7105

页数：4

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