p-wave Superfluidity by Spin-Nematic Fermi Surface Deformation
Abstract
We study attractively interacting fermions on a square lattice with dispersion relations exhibiting strong spin-dependent anisotropy. The resulting Fermi surface mismatch suppresses the s-wave BCS-type instability, clearing the way for unconventional types of order. Unbiased sampling of the Feynman diagrammatic series using Diagrammatic Monte Carlo methods reveals a rich phase diagram in the regime of intermediate coupling strength. Instead of a proposed Cooper-pair Bose metal phase [A. E. Feiguin and M. P. A. Fisher, Phys. Rev. Lett. 103, 025303 (2009)] we find an incommensurate density wave at strong anisotropy and two different p-wave superfluid states with unconventional symmetry at intermediate anisotropy.
Cite
@article{arxiv.1408.3119,
title = {p-wave Superfluidity by Spin-Nematic Fermi Surface Deformation},
author = {Jan Gukelberger and Evgeny Kozik and Lode Pollet and Nikolay Prokof'ev and Manfred Sigrist and Boris Svistunov and Matthias Troyer},
journal= {arXiv preprint arXiv:1408.3119},
year = {2015}
}
Comments
published version, supplemental material included as appendix, 4+4 pages, 5+7 figures