Imbalanced Superfluid Fermi Gas on a Lieb Lattice

Marek Tylutki
April 19th, 2018 MAREK TYLUTKI Department of Applied Physics
Aalto University

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.

Seminar, April 19, 2018, 15:00. ICFO’s Seminar Room

Hosted by Prof. Maciej Lewenstein