Phys. Rev. Lett. 99, 230403 (2007) [4 pages]Superfluid-Insulator Transitions of the Fermi Gas with Near-Unitary Interactions in a Periodic PotentialReceived 24 July 2007; published 5 December 2007 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 aL, 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=Vc. We compute the universal ratio VcmaL2/ℏ2 at N=∞ 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.230403
DOI:
10.1103/PhysRevLett.99.230403
PACS:
05.30.Fk, 03.75.Ss, 67.90.+z, 73.43.Nq
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.