Single-particle spectral function of the Holstein-Hubbard bipolaron

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dc.creatorHohenadler, Martin
dc.creatorAichhorn, Markus
dc.creatorvon der Linden, Wolfgang
dc.date2004-05-18
dc.date2004-11-30
dc.date.accessioned2026-07-07T08:05:25Z
dc.date.available2026-07-07T08:05:25Z
dc.descriptionThe one-electron spectral function of the Holstein-Hubbard bipolaron 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 study, for the first time, 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 interaction. A good agreement is found with the most accurate calculations of the bipolaron dispersion available, over a large range of the electron-phonon coupling strength. Additionally, pronounced deviations of the bipolaron dispersion from a simple tight-binding band are found, which can be attributed to next-nearest-neighbor hopping processes.
dc.description12 pages, 6 figures; final version, to appear in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0405391
dc.identifierhttp://arxiv.org/abs/cond-mat/0405391
dc.identifierPhys. Rev. B 71, 014302 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.014302
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/130276
dc.subjectStrongly Correlated Electrons
dc.titleSingle-particle spectral function of the Holstein-Hubbard bipolaron
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