“Imbalanced Superfluid Fermi Gas on a Lieb Lattice" SEMINAR ANNOUNCEMENT

SEMINAR ANNOUNCEMENT

Tuesday, 17^th of April 2018 at 16:00
UPC campus Nord, B4-212 (aula seminari)

Marek Tylutki

Aalto University, 

Finland

“Imbalanced Superfluid Fermi Gas on a Lieb Lattice"

Abstract

We study the Hubbard model with spin imbalance on a Lieb lattice, which features a flat band. The flat band is known to enhance superfluidity due to a diverging density of states. We obtain a phase diagram of this system, and we identify a variety of phases. Apart from the standard BCS and normal states, we observe the Fulde-Ferrell-Larkin-Ovchinnikov type phases with space-dependent pairing function. We also find a thermodynamically stable Sarma phase, where the imbalance coexists with a spatially uniform order parameter.

https://arxiv.org/abs/1802.00274