Global-local ansatz and dynamical coherent potential approximation study of off-diagonal exciton-phonon coupling

Global-local ansatz and dynamical coherent potential approximation study of off-diagonal exciton-phonon coupling

We study the generalized Holstein Hamiltonian in the simultaneous presence of diagonal and off-diagonal exciton-phonon couplings using the global-local Ansatz and the dynamical coherent potential approximation (under the Hartree approximation). The former yields detailed exciton-phonon correlations...

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Bibliographic Details
Main Authors: Liu, Qingmei, Zhao, Yang, Wang, Weihua, Kato, Tsuyoshi
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2011
Subjects:
DRNTU::Science::Physics::Atomic physics::Solid state physics
Online Access:https://hdl.handle.net/10356/99800
http://hdl.handle.net/10220/6740
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Institution: Nanyang Technological University
Language: English
Description
Summary:We study the generalized Holstein Hamiltonian in the simultaneous presence of diagonal and off-diagonal exciton-phonon couplings using the global-local Ansatz and the dynamical coherent potential approximation (under the Hartree approximation). The former yields detailed exciton-phonon correlations for polaron states in the lowest polaron energy band in addition to the state-of-the-art ground-state wave functions, while the latter reveals polaron dynamic information in the form of extended energy spectra and spectral density functions. Lowest polaron energy bands generated by the two methods are compared.

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