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Nematic Order by Disorder in Spin-2 Bose-Einstein Condensates

Turner, Ari M. and Barnett, Ryan and Demler, Eugene and Vishwanath, Ashvin (2007) Nematic Order by Disorder in Spin-2 Bose-Einstein Condensates. Physical Review Letters, 98 (19). Art. No. 190404. ISSN 0031-9007. doi:10.1103/PhysRevLett.98.190404.

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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.

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Additional Information:©2007 The American Physical Society (Received 6 February 2007; published 11 May 2007) We would like to thank Daniel Podolsky, Gil Refael, and Dan Stamper-Kurn for insightful discussions and Fei Zhou for alerting us to [21], where similar results are obtained. Support from the Hellman Family Fund and LBNL No. DOE-504108 (A.V.), NSF Grant No. 0132874, AFOSR and Harvard-MIT CUA (E.D. and A.M.T.), and the Sherman Fairchild Foundation (R.B.) is acknowledged.
Issue or Number:19
Record Number:CaltechAUTHORS:TURprl07
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8425
Deposited By: Archive Administrator
Deposited On:03 Aug 2007
Last Modified:08 Nov 2021 20:50

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