Turner, Ari M.Barnett, RyanDemler, EugeneVishwanath, Ashvin2016-08-242007Turner, Ari M., Ryan Barnett, Eugene Demler, and Ashvin Vishwanath. 2007. “Nematic Order by Disorder in Spin-2 Bose-Einstein Condensates.” Physical Review Letters 98 (19) (May 11). doi:10.1103/physrevlett.98.190404.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:27891676We 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.en-USJournal Article2016-08-2410.1103/PhysRevLett.98.190404