Journal
EPL
Volume 100, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1209/0295-5075/100/50003
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Funding
- NBRP of China [2012CB921300, 2013CB921900]
- NSF of China [10825417, 11274024]
- RFDP of China [20110001110091]
- DARPA-YFA [N66001-10-1-4025]
- ARO [W911NF-09-1-0248]
- NSF-PHY [1104546]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1104546] Funding Source: National Science Foundation
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We study the superfluidity of a spin-orbit coupled Bose-Einstein condensate (BEC) by computing its Bogoliubov excitations, which are found to have two branches: one is gapless and phonon-like at long wavelength; the other is typically gapped. These excitations imply superfluidity that has two new features: i) due to the absence of the Galilean invariance, one can no longer define the critical velocity of superfluidity independent of the reference frame; ii) the superfluidity depends not only on whether the speed of the BEC exceeds a critical value, but also on cross-helicity that is defined as the direction of the cross-product of the spin and the kinetic momentum of the BEC. Copyright (C) EPLA, 2012
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