in collaboration with Tin-Lun Ho
Department of Physics, Ohio-State
University, Columbus, OH
Feshbach resonance gives rise to the
strongest fermionic superfluid whose pairing energy is of the same order of
magnitude as the Fermi energy. Under certain circumstance, the physics
becomes even more intriguing due to the interplay between resonance physics
and Landau levels (when the gases are under fast rotation) or band
structure (when the gases are loaded into optical lattices). Here we will
report (i) in the rotating superfluid how the critical rotational frequency
for destroying superfluidity depends on the scattering length, where the
Landau level structure will manifest itself in a series of steps in the
phase boundary; (ii) in the optical lattices the fermion superfluid will
turn into a band-insulator as the increase of lattice depth, which is
driven by energy gain in promoting fermions from valence band to various
conducting bands to form Cooper pairs.
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