Phys. Rev. B 75, 136501 (2007) [4 pages]Comment on “Superfluid stability in the BEC-BCS crossover”Received 7 August 2006; revised 6 December 2006; published 5 April 2007 We point out an error in recent work by Pao, Wu and Yip Phys. Rev. B 73 132506 (2006), that stems from their use of a necessary but not sufficient condition [positive compressibility (magnetic susceptibility) and superfluid stiffness] for the stability of the ground state of a polarized Fermi gas. As a result, for a range of detunings their proposed ground-state solution is a local maximum rather than a minimum of the ground state energy, which thereby invalidates their proposed phase diagram for resonantly interacting fermions under an imposed population difference. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.136501
DOI:
10.1103/PhysRevB.75.136501
PACS:
03.75.Ss, 05.30.Fk, 34.90.+q
See AlsoOriginal Article: C.-H. Pao, Shin-Tza Wu, and S.-K. Yip, Superfluid stability in the BEC-BCS crossover, Phys. Rev. B 73, 132506 (2006). |
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