Fulde-Ferrell-Larkin-Ovchinnikov pairing as leading instability on the square lattice
Abstract
We study attractively interacting spin-1/2 fermions on the square lattice subject to a spin population imbalance. Using unbiased diagrammatic Monte Carlo simulations we find an extended region in the parameter space where the Fermi liquid is unstable towards formation of Cooper pairs with non-zero center-of-mass momentum, known as the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. In contrast to earlier mean-field and quasi-classical studies we provide quantitative and well-controlled predictions on the existence and location of the relevant Fermi-liquid instabilities. The highest temperature where the FFLO instability can be observed is about half of the superfluid transition temperature in the unpolarized system.
Keywords
Cite
@article{arxiv.1509.05050,
title = {Fulde-Ferrell-Larkin-Ovchinnikov pairing as leading instability on the square lattice},
author = {Jan Gukelberger and Sebastian Lienert and Evgeny Kozik and Lode Pollet and Matthias Troyer},
journal= {arXiv preprint arXiv:1509.05050},
year = {2016}
}
Comments
7 pages, 4 figures; v2: improved references and discussion, added calculations with larger cutoff order that corroborate our earlier results