Counterflow Superfluidity of Two-Species Ultracold Atoms in a Commensurate Optical Lattice
Counterflow Superfluidity of Two-Species Ultracold Atoms in a Commensurate Optical Lattice
In the Mott-insulator regime, two species of ultracold atoms in an optical lattice can exhibit the low-energy counterflow motion. We construct effective Hamiltonians for the three classes of the two-species (fermion-fermion, boson-boson, and boson-fermion-type) insulators and reveal the conditions when the resulting ground state supports super-counter-fluidity (SCF), with the alternative …