Flow-Induced Charge Modulation in Superfluid Atomic Fermions Loaded into an Optical Kagome Lattice

Daisuke Yamamoto, Chika Sato, Tetsuro Nikuni, Shunji Tsuchiya

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Abstract

We study the superfluid state of atomic fermions in a tunable optical kagome lattice motivated by recent experiments. We show that the imposed superflow induces spatial modulations in the density and order parameter of the pair condensate and leads to a charge modulated superfluid state analogous to a supersolid state. The spatial modulations in the superfluid emerge due to the geometric effect of the kagome lattice that introduces anisotropy in hopping amplitudes of fermion pairs in the presence of superflow. We also study superflow instabilities and find that the critical current limited by the dynamical instability is quite enhanced due to the large density of states associated with the flatband. The charge modulated superfluid state can sustain high temperatures close to the transition temperature that is also enhanced due to the flatband and is therefore realizable in experiments.

Original languageEnglish
Article number145304
JournalPhysical Review Letters
Volume110
Issue number14
DOIs
Publication statusPublished - 2013 Apr 4
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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