Nematic order by disorder in spin-2 bose-einstein condensates

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Title: Nematic order by disorder in spin-2 bose-einstein condensates
Authors: Turner, AM
Barnett, R
Demler, E
Vishwanath, A
Item Type: Journal Article
Abstract: We show that quantum and thermal fluctuations in spin-2 Bose-Einstein condensates lift the accidental degeneracy of the mean-field phase diagram. Fluctuations select the uniaxial (square biaxial) nematic state for scattering lengths a4>a2 (a4<a2). Paradoxically, the order is stronger at higher temperatures. For spin-2 87Rb and 23Na, a continuous Ising-type transition is predicted on raising the magnetic field, from a fluctuation stabilized uniaxial state to a field stabilized square biaxial order state. This is a promising experimental system to realize the “order-by-disorder” phenomenon.
Issue Date: 11-May-2007
Date of Acceptance: 1-May-2007
URI: http://hdl.handle.net/10044/1/55408
DOI: https://dx.doi.org/10.1103/PhysRevLett.98.190404
ISSN: 0031-9007
Publisher: American Physical Society
Journal / Book Title: Physical Review Letters
Volume: 98
Issue: 19
Copyright Statement: © 2007 American Physical Society
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
SYMMETRY
GASES
cond-mat.other
02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 190404
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences



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