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research article
Superfluidity of spinor Bose-Einstein condensates
2013
We consider a spin-1/2 Bose-Einstein condensate initially prepared in a single-spin projection. The two channels of dynamical excitations existing in such a system (density and spin waves) are discussed and we show how pure spin waves can be excited in the presence of local magnetic defects. We analyze the role played by spin excitations on the Landau superfluidity criterion and demonstrate the absence of absolute superfluidity for the antiferromagnetic condensate. In the ferromagnetic case, we identify two critical velocities for the breakdown of superfluidity.
Type
research article
Web of Science ID
WOS:000326819800003
Authors
Publication date
2013
Publisher
Published in
Volume
88
Issue
18
Article Number
184503
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
December 9, 2013
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