Nematic order by disorder in spin-2 Bose-Einstein condensates

被引：73
作者：
Turner, Ari M. [1 ]
Barnett, Ryan
Demler, Eugene
Vishwanath, Ashvin
机构：
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] CALTECH, Dept Phys, Pasadena, CA 91125 USA
[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 19期
关键词：
SYMMETRY;
D O I：
10.1103/PhysRevLett.98.190404
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 a(4)> a(2) (a(4)< a(2)). Paradoxically, the order is stronger at higher temperatures. For spin-2 Rb-87 and Na-23, 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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页数：4
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