Spectral function of electron-phonon models by cluster perturbation theory

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Abstract

Cluster perturbation theory in combination with the Lanczos method is used to compute the one-electron spectral function of the Holstein polaron in one and two dimensions. It is shown that the method allows reliable calculations using relatively small clusters, and at the same time significantly reduces finite-size effects. Results are compared with exact data and the relation to existing work is discussed. We also use a strong-coupling perturbation theory--equivalent to the Hubbard I approximation--to calculate the spectral function of the quarter-filled Holstein model of spinless fermions, starting from the exact atomic-limit Green function. The results agree well with previous calculations within the many-body coherent potential approximation.
Original languageEnglish
Pages (from-to)184304-184304
JournalPhysical Review / B
Volume68
DOIs
Publication statusPublished - 2003

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perturbation theory
Gene Conversion
Fermions
Electrons
approximation
Green's function
electrons
Green's functions
fermions

Keywords

  • cond-mat.str-el

Cite this

Spectral function of electron-phonon models by cluster perturbation theory. / Hohenadler, Martin; Aichhorn, Markus; Linden, Wolfgang von der.

In: Physical Review / B, Vol. 68, 2003, p. 184304-184304.

Research output: Contribution to journalArticleResearchpeer-review

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AB - Cluster perturbation theory in combination with the Lanczos method is used to compute the one-electron spectral function of the Holstein polaron in one and two dimensions. It is shown that the method allows reliable calculations using relatively small clusters, and at the same time significantly reduces finite-size effects. Results are compared with exact data and the relation to existing work is discussed. We also use a strong-coupling perturbation theory--equivalent to the Hubbard I approximation--to calculate the spectral function of the quarter-filled Holstein model of spinless fermions, starting from the exact atomic-limit Green function. The results agree well with previous calculations within the many-body coherent potential approximation.

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