Counterflow superfluid of polaron pairs in Bose-Fermi mixtures in optical lattices

Abstract

We study the quantum phases of one-dimensional Bose-Fermi mixtures in optical lattices. Assuming repulsive interparticle interactions, equal mass, and unit total filling, we calculate the ground-state phase diagram by means of both Tomonaga-Luttinger liquid theory and time-evolving block decimation method. We demonstrate the existence of a counterflow superfluid (CFSF) phase of polaron pairs, which are composite particles consisting of two fermions and two bosonic holes, in a broad range of the parameter space. We find that this phase naturally emerges in ${}^{174}$Yb-${}^{173}$Yb mixtures, realized in recent experiments, at low temperatures.

5 pages, 5 figures

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Cited by in corpus (6)

• Induced pairing of fermionic impurities in a one-dimensional strongly correlated Bose gas
• Matter-wave solitons in the counterflow of two immiscible superfluids
• Enhanced visibility of the Fulde-Ferrell-Larkin-Ovchinnikov state in one dimensional Bose-Fermi mixtures near the immiscibility point
• Goldstino spectrum in an ultracold Bose-Fermi mixture with explicitly broken supersymmetry
• Phase Equilibrium of Binary Mixtures in Mixed Dimensions
• Composite pairing and superfluidity in a one-dimensional resonant Bose-Fermi mixture