Effect of different site energies on polaronic properties

Details Effect of different site energies on polaronic properties Effect of different site energies on polaronic properties

2005-02-24

arxiv.org/abs/cond-mat/0502568v1

Eur. Phys. Jour. B Vol 46 page 481 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 7 figures, submitted to PRB

Scientific paper

10.1140/epjb/e2005-00277-1

Using the perturbation method based on a variational phonon basis obtained by the modified Lang-Firsov (MLF) transformation, the two-site single polaron Holstein model is studied in presence of a difference in bare site energies ($\epsilon_d$=$\epsilon_2$-$\epsilon_1$). The polaronic ground-state wave function is calculated up to the fifth order of perturbation. The effect of $\epsilon_d$ (acts as a site-energy 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.

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