Localized polarons and doorway vibrons in finite quantum structures

H. Fehske, G. Wellein, J. Loos, and A. R. Bishop
Phys. Rev. B 77, 085117 – Published 21 February 2008

Abstract

We consider transport through finite quantum systems such as quantum barriers, wells, dots, and junctions, coupled to local vibrational modes in the quantal regime. As a generic model, we study the Holstein-Hubbard Hamiltonian with site-dependent potentials and interactions. Depending on the barrier height to electron-phonon coupling strength ratio and the phonon frequency, we find distinctly opposed behaviors: vibration-mediated tunneling or intrinsic localization of (bi)polarons. These regimes are strongly manifested in the density correlations, mobility, and optical response calculated by exact numerical techniques.

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  • Received 17 October 2007

DOI:https://doi.org/10.1103/PhysRevB.77.085117

©2008 American Physical Society

Authors & Affiliations

H. Fehske1, G. Wellein2, J. Loos3, and A. R. Bishop4

  • 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, 17487 Greifswald, Germany
  • 2Regionales Rechenzentrum Erlangen, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
  • 3Institute of Physics, Academy of Sciences of the Czech Republic, 16200 Prague, Czech Republic
  • 4Theory, Simulation, and Computation Directorate, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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Issue

Vol. 77, Iss. 8 — 15 February 2008

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