Lattice polaron formation: Effects of nonscreened electron-phonon interaction

H. Fehske, J. Loos, and G. Wellein
Phys. Rev. B 61, 8016 – Published 15 March 2000
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Abstract

We explore the quasiparticle properties of lattice polarons on the basis of a quite general electron-phonon Hamiltonian with a long-range displacement-type interaction. To treat the dynamical quantum phonons without significant loss of accuracy we adapt an exact Lanczos diagonalization method and compute various static and dynamical quantities, such as the electron-lattice correlation function, the polaron band dispersion, the effective polaron mass, the kinetic energy, the single-particle spectral function, and the optical conductivity, on finite one-dimensional lattices for a wide range of model parameters. We compare the results with those obtained for the standard Holstein model with short-range electron-phonon interaction only.

  • Received 11 November 1999

DOI:https://doi.org/10.1103/PhysRevB.61.8016

©2000 American Physical Society

Authors & Affiliations

H. Fehske

  • Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany

J. Loos

  • Institute of Physics, Czech Academy of Sciences, 16200 Prague, Czech Republic

G. Wellein

  • Regionales Rechenzentrum Erlangen, Universität Erlangen, 91058 Erlangen, Germany

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Vol. 61, Iss. 12 — 15 March 2000

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