Spectral function of the small polaron

1997/04/30 by Jean‐Marc Robin, J. M. Robin · 4 citations
Materials Science · Physics and Astronomy · #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.56.13634

published as Phys. Rev. B, 56 (1997) 13 634 · revtex 3 pages, 6 eps figures. 4 c programs added

arxiv created 1997/07/08 · openalex publication_date 1997/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We compute exactly both the spectral function of the electron and of the small polaron for the two site Holstein model. We find that for intermediary coupling, the small polaron is a better fundamental excitation of the system than the electron. However, the Lang-Firsov approximation fails to predict the right dispersion relation for the small polaron.

Cited by

• A density matrix approach to the dynamical properties of a two-site Holstein model
• Single-particle excitations and phonon softening in the one-dimensional spinless Holstein model
• Tunnelling system coupled to a harmonic oscillator: an analytical treatment
• Excitation spectrum of the Holstein model