19 April

Imbalanced superfluid Fermi gas on a Lieb lattice

Thursday 19 April 2018, 03:00pm

ICFO Seminar Room, Castelldefels, Barcelona

By Marek Tylutki, Aalto University

Short 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. 


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