Superconductivity and Pairing Fluctuations in the Half-Filled Two-Dimensional Hubbard Model
Abstract
The two-dimensional Hubbard model exhibits superconductivity with d-wave symmetry even at half-filling in the presence of 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 (\pi, 0) varies non-monotonously 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.
Cite
@article{arxiv.1102.1911,
title = {Superconductivity and Pairing Fluctuations in the Half-Filled Two-Dimensional Hubbard Model},
author = {Michael Sentef and Philipp Werner and Emanuel Gull and Arno P. Kampf},
journal= {arXiv preprint arXiv:1102.1911},
year = {2011}
}
Comments
4.3 pages, 4 figures