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Nematic order by disorder in spin-2 Bose-Einstein condensates | | Ari M Turner
; Ryan Barnett
; Eugene Demler
; Ashvin Vishwanath
; | | Date: |
11 May 2007 | | Journal: | Phys Rev Lett, 98 (19), 190404 | | 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. | | Source: | PubMed, pmid17677609 | | Services: | Forum | Review | Favorites | |
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