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arXiv:cond-mat/0204380 · The European Physical Journal B

Landau-Fermi liquid analysis of the 2D t-t' Hubbard model

P.A. Frigeri, Carsten Honerkamp A, Thomas Maurice Rice

Published Jul 1, 2002• 10 citations
arXivHTMLPDF
DOI
10.1140/epjb/e2002-00200-4

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We study the paramagnetic phase of the Hubbard model at low density in 2D. In addition to the Landau Fermi liquid phase at small U > 0, in which fk is discontinuous at kF, we find a novel "Quantum Fermi Liquid" (QFL) phase for [Formula: see text](≈ 17 ∊F) in which fk is continuous at kF but df/dk|F = −∞. The lifetime of QFL quasiparticles at kF is τ ∝ T−1 (rather than T−2). The phenomenological "Marginal Fermi Liquid" is identified as a special case of the QFL at [Formula: see text] precisely.