Robustness of the Van Hove scenario for high-T(c) superconductors

The pinning of the Fermi level to the Van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group technique. The "Van Hove" scenario of non-Fermi-liquid behavior for high-T(c) compounds can take place in a...

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Published in:Physical review letters 2002-08, Vol.89 (7), p.076401-076401
Main Authors: Irkhin, V Yu, Katanin, A A, Katsnelson, M I
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Katsnelson, M I
description The pinning of the Fermi level to the Van Hove singularity and the formation of flat bands in the two-dimensional t-t' Hubbard model is investigated by the renormalization group technique. The "Van Hove" scenario of non-Fermi-liquid behavior for high-T(c) compounds can take place in a broad enough range of the hole concentrations. The results are in qualitative agreement with the recent angle-resolved photoemission spectroscopy data on La 2CuO (4).
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title Robustness of the Van Hove scenario for high-T(c) superconductors
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