Perturbative expansion using a variational phonon basis for the Holstein model

被引：4
|
作者：
Chatterjee, J
Das, AN
Choudhury, P
机构：
[1] Saha Inst Nucl Phys, Theoret Condensed Matter Phys Div, Kolkata 700064, W Bengal, India
[2] Cent Glass & Ceram Res Inst, Kolkata 700032, W Bengal, India
来源：
SOLID STATE COMMUNICATIONS | 2003年 / 126卷 / 03期
关键词：
electron-phonon interactions; Holstein model; perturbation study;
D O I：
10.1016/S0038-1098(03)00035-8
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
A simple variational displacement phonon basis. obtained through the modified Lang-Firsov (MLF) transformation, is proposed to study the Holstein model. This phonon basis contains only one variational parameter, but capable of describing lattice distortions at distant sites from the charge carrier. A perturbation method based on this MLF basis is employed to calculate the single-electron ground-state energy and the dispersion of the polaronic band. The ground-state (k = 0) energy obtained up to the second-order perturbation within this approach agrees well with the available numerical results for the entire range of coupling strength. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：113 / 118
页数：6
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