Effect of different site energies on polaronic properties

2005/02/24 by Jayita Chatterjee, J. Chatterjee, A. N. Das
Materials Science · Physics and Astronomy · #Nonlinear Photonic Systems #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1140/epjb/e2005-00277-1

published as Eur. Phys. Jour. B Vol 46 page 481 (2005) · 9 pages, 7 figures, submitted to PRB

arxiv created 2005/02/24 · openalex publication_date 2005/08/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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 (ε_d=ε₂-ε₁). The polaronic ground-state wave function is calculated up to the fifth order of perturbation. The effect of ε_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 ε_d, role of disorder on the properties of the double-exchange system is also discussed.

Citations

• Density-matrix renormalization-group study of the polaron problem in the Holstein model
• Interplay between spin and phonon fluctuations in the double-exchange model for the manganites