Proximity of the superconducting dome and the quantum critical point in the two-dimensional Hubbard model

We use the dynamical cluster approximation to understand the proximity of the superconducting dome to the quantum critical point in the two-dimensional Hubbard model. In a BCS formalism, T(c) may be enhanced through an increase in the d-wave pairing interaction (V(d)) or the bare pairing susceptibil...

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Published inPhysical review letters Vol. 106; no. 4; p. 047004
Main Authors Yang, S-X, Fotso, H, Su, S-Q, Galanakis, D, Khatami, E, She, J-H, Moreno, J, Zaanen, J, Jarrell, M
Format Journal Article
LanguageEnglish
Published United States 26.01.2011
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Summary:We use the dynamical cluster approximation to understand the proximity of the superconducting dome to the quantum critical point in the two-dimensional Hubbard model. In a BCS formalism, T(c) may be enhanced through an increase in the d-wave pairing interaction (V(d)) or the bare pairing susceptibility (χ(0d)). At optimal doping, where V(d) is revealed to be featureless, we find a power-law behavior of χ(0d)(ω=0), replacing the BCS log, and strongly enhanced T(c). We suggest experiments to verify our predictions.
ISSN:1079-7114
DOI:10.1103/physrevlett.106.047004