Trapping_of_lattice_polarons _Alexandrov.pdf (155.43 kB)
Download fileTrapping of lattice polarons by impurities
journal contribution
posted on 2009-02-25, 13:10 authored by J.P. Hague, P.E. Kornilovitch, A.S. AlexandrovWe 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