Abstract
We explore the superfluid phases of a two-component Fermi mixture with hybridized orbitals in optical lattices. We show that there exists a general mapping of this system to the Lieb lattice. By using simple multiband models with hopping between - and -orbital states, we show that superfluid order parameters can have a -phase difference between lattice sites, which is distinct from the case with hopping between orbitals. If the population imbalance between the two spin species is tuned, the superfluid phase may evolve through various phases due to the interplay between hopping, interactions, and imbalance. We show that the rich behavior is observable in experimentally realizable systems.
4 More- Received 22 August 2015
DOI:https://doi.org/10.1103/PhysRevA.92.053616
©2015 American Physical Society