Superfluid-insulator transitions of the fermi gas with near-unitary interactions in a periodic potential

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We consider spin-1/2 fermions of mass m with interactions near the unitary limit. In an applied periodic potential of amplitude V and period a(L), and with a density of an even integer number of fermions per unit cell, there is a second-order quantum phase transition between superfluid and insulating ground states at a critical V = V(c). We compute the universal ratio V(c)ma(L)(2)/h(2) at N = infinity in a model with Sp(2N) spin symmetry. The insulator interpolates between a band insulator of fermions and a Mott insulator of fermion pairs. We discuss implications for recent experiments.
Publisher
AMER PHYSICAL SOC
Issue Date
2007-12
Language
English
Article Type
Article
Keywords

OPTICAL LATTICE

Citation

PHYSICAL REVIEW LETTERS, v.99, no.23

ISSN
0031-9007
DOI
10.1103/PhysRevLett.99.230403
URI
http://hdl.handle.net/10203/200033
Appears in Collection
PH-Journal Papers(저널논문)
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