Finite momentum condensate brought on by Zeeman field
Abstract
We study superfluid states in a two-dimensional fermionic attractive Hubbard model with Zeeman coupling to an external field. Focusing our attention on singlet pairing in both weak and strong coupling regimes, we reveal a rich phase diagram of finite momentum condensates which exhibits both Fulde-Ferrell and Larkin-Ovchinnikov orders at zero temperature. The latter are commensurate stripe states that spontaneously break a lattice symmetry; many stable ordering wavevectors are found as a function of particle density and Zeeman field. Stronger coupling significantly enhances the stability of the finite momentum condensates, but our numerical mean-field calculations underestimate the effect of fluctuations and indicate a possible localization near half-filling.
Keywords
Cite
@article{arxiv.2006.10912,
title = {Finite momentum condensate brought on by Zeeman field},
author = {Stephen Keeling and Predrag Nikolić},
journal= {arXiv preprint arXiv:2006.10912},
year = {2021}
}
Comments
8 pages, 6 figures