Superconducting Phase and Pairing Fluctuations in the Half-Filled Two-Dimensional Hubbard Model
Michael Sentef, Philipp Werner, Emanuel Gull, Arno P. Kampf
DOI 10.1103/PhysRevLett.107.126401 · Physical Review Letters
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Abstract
The two-dimensional Hubbard model exhibits superconductivity with d-wave symmetry even at half-filling in the presence of a next-nearest neighbor hopping. Using plaquette cluster dynamical mean-field theory with a continuous-time quantum Monte Carlo impurity solver, we reveal the non-Fermi liquid character of the metallic phase in proximity to the superconducting state. Specifically, the low-frequency scattering rate for momenta near (π,0) varies nonmonotonically at low temperatures, and the dc conductivity is T linear at elevated temperatures with an upturn upon cooling. Evidence is provided that pairing fluctuations dominate the normal-conducting state even considerably above the superconducting transition temperature.
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