Chatterjee, J and Das, A N and Choudhury, Pranab (2003) Perturbative expansion using a variational phonon basis for the Holstein model. Solid State Communications, 126 (3). pp. 113-118. ISSN 0038-1098

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Eectron-phonon Interactions; Holstein model; Perturbation study
Subjects:	Processing Science
Divisions:	UNSPECIFIED
Depositing User:	Subhra Lahiri
Date Deposited:	14 Feb 2012 11:54
Last Modified:	14 Feb 2012 11:54
URI:	http://cgcri.csircentral.net/id/eprint/835

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