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Trapping of lattice polarons by impurities

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journal contribution
posted on 25.02.2009, 13:10 by J.P. Hague, P.E. Kornilovitch, A.S. Alexandrov
We consider the effects of impurities on polarons in three dimensions using a continuous time quantum Monte Carlo algorithm. An exact treatment of the phonon degrees of freedom leads to a very efficient algorithm, and we are able to compute the polaron dynamics on an infinite lattice by developing an auxiliary weighting scheme. The magnitude of the impurity potential, the electron-phonon coupling, and the phonon frequency are varied. We determine the magnitude of the impurity potential required for polaron trapping. For small electron-phonon coupling the number of phonons increases dramatically on trapping combined with a sharp decrease in kinetic energy. The polaron binding diagram is computed, showing that intermediatecoupling low-phonon-frequency polarons are localized by exceptionally small impurities.

History

School

  • Science

Department

  • Physics

Citation

HAGUE, J.P., KORNILOVITCH, P.E. and ALEXANDROV, A.S., 2008. Trapping of lattice polarons by impurities. Physical Review B, 78(9), 092302 pp. 1-4.

Publisher

© American Physical Society

Version

VoR (Version of Record)

Publication date

2008

Notes

This article has been published in the journal, Physical Review B [© American Physical Society]. The definitive version is available at: http://link.aps.org/doi/10.1103/PhysRevB.78.092302

ISSN

1098-0121

Language

en

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