https://doi.org/10.1140/epjb/e2005-00277-1
Effect of different site energies on polaronic properties
Theoretical Condensed Matter Physics Group, Saha Institute of Nuclear Physics,
1/AF Bidhannagar, Kolkata 700064, India
Corresponding author: a jayita.chatterjee@saha.ac.in
Received:
18
April
2005
Revised:
7
June
2005
Published online:
7
September
2005
A two-site single polaron Holstein model is studied in presence of
a difference in bare site energies (
)
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 
(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 ,
role of disorder on the properties of the double-exchange system
is also discussed.
PACS: 71.38.-k – Polarons and electron-phonon interactions / 63.20.kr – Phonon-electron and phonon-phonon interactions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
