Effect of different site energies on polaronic properties

J. Chatterjee () and A. N. Das

The European Physical Journal B: Condensed Matter and Complex Systems, 2005, vol. 46, issue 4, 481-488

Abstract: A two-site single polaron Holstein model is studied in presence of a difference in bare site energies (epsilon d =epsilon 2 -epsilon 1 ) using the perturbation theory with the variational modified Lang-Firsov (MLF) phonon basis. The polaronic ground-state wave function is calculated up to the fifth order of perturbation. The effect of epsilon d (acts as a strength of diagonal disorder) on the polaron crossover, polaronic kinetic energy, oscillator wavefuncion and polaron localization are studied. Considering a double-exchange Holstein model with finite epsilon d , role of disorder on the properties of the double-exchange system is also discussed. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Date: 2005
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DOI: 10.1140/epjb/e2005-00277-1

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