Chiral d+is superconducting state in the two dimensional t-t' Hubbard model
Superconductivity
2009-11-10 v1 Strongly Correlated Electrons
Abstract
Applying the recently developed variational approach to Kohn-Luttinger superconductivity to the t-t' Hubbard model in two dimensions, we have found, for sizeable next-nearest neighbor hopping, an electron density controlled quantum phase transition between a d-wave superconducting state close to half filling and an s-wave superconductor at lower electron density. The transition occurs via an intermediate time reversal breaking d+is superconducting phase, which is characterized by nonvanishing chirality and density-current correlation. Our results suggest the possibility of a bulk time reversal symmetry breaking state in overdoped cuprates.
Cite
@article{arxiv.cond-mat/0309183,
title = {Chiral d+is superconducting state in the two dimensional t-t' Hubbard model},
author = {J. Mraz and R. Hlubina},
journal= {arXiv preprint arXiv:cond-mat/0309183},
year = {2009}
}