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

• 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
• Institution: Nanyang Technological University

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...