Single-particle spectral function of the Holstein-Hubbard bipolaren

Martin Hohenadler*, Markus Aichhorn, Wolfgang Von Der Linden

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikelBegutachtung

Abstract

The one-electron spectral function of the Holstein-Hubbard bipolaren in one dimension is studied using cluster perturbation theory together with the Lanczos method. In contrast to other approaches, this allows one to calculate the spectrum at continuous wave vectors and thereby to investigate the dispersion and the spectral weight of quasiparticle features. The formation of polarons and bipolarons, and their manifestation in the spectral properties of the system, is studied for the cases of intermediate and large phonon frequencies, with and without Coulomb repulsion. A good agreement is found with the most accurate calculations of the bipolaron band dispersion available. Pronounced deviations of the bipolaren band structure from a simple tight-binding band are observed, which can be attributed to next-nearest- neighbor hopping processes.

Originalspracheenglisch
Aufsatznummer014302
FachzeitschriftPhysical Review B
Jahrgang71
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - Jan 2005

ASJC Scopus subject areas

  • Elektronische, optische und magnetische Materialien
  • Physik der kondensierten Materie

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