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Spectral properties of a narrow-band Anderson model

Abstract:

We consider single-particle spectra of a symmetric narrow-band Anderson impurity model, where the host bandwidth D is small compared to the hybridization strength Δ0. Simple second-order perturbation theory (2PT) in U is found to produce a rich spectral structure that leads to rather good agreement with extant Lanczos results and offers a transparent picture of the underlying physics. It also leads naturally to two distinct regimes of spectral behavior, Δ0Z/D≫1 and ≪1 (with Z the quasiparticl...

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Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Chemistry, Physical and Theoretical Chem
Role:
Author
Journal:
PHYSICAL REVIEW B
Volume:
63
Issue:
4
Pages:
451221-451229
Publication date:
2001-01-15
ISSN:
1098-0121
URN:
uuid:2bffacb3-ef44-400d-998a-567ab3c5adf0
Source identifiers:
37729
Local pid:
pubs:37729
Language:
English

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