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

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

2012-04-18

arxiv.org/abs/1204.3988v1

Physics

Condensed Matter

Quantum Gases

4.1 pages, 5 figures

Scientific paper

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 a fermion and a bosonic hole, 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.

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