Volume 89, Number 3, February 2010
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 February 2010|
Holstein polaron in the presence of disorder
Department of Physics and Astronomy, University of British Columbia - Vancouver, BC, Canada, V6T 1Z1
2 Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN - Wako 351-0198, Japan
3 Russian Research Centre “Kurchatov Institute” - 123182 Moscow, Russia
4 Department of Applied Physics, University of Tokyo - 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan
Accepted: 20 January 2010
Non-local, inhomogeneous and retarded response similar to that observed in experiments is studied theoretically by introducing the Inhomogeneous Momentum Average (IMA) approximation for single-polaron problems with disorder in the on-site potential and/or spatial variations of the electron-phonon couplings and/or phonon frequencies. We show that the electron-phonon coupling gives rise to an additional inhomogeneous, strongly retarded potential. This potential describes essential physics ignored by ”instanteneous” approximations. The accuracy of IMA is demonstrated by comparison with single-impurity results from the approximation-free Diagrammatic Monte Carlo (DMC) method. Its simplicity allows for easy study of many problems that were previously unaccessible.
PACS: 71.38.-k – Polarons and electron-phonon interactions / 72.10.Di – Scattering by phonons, magnons, and other nonlocalized excitations / 63.20.kd – Phonon-electron interactions
© EPLA, 2010
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