Tuesday, May 1, 2012

1204.6534 (Tomoki Ozawa et al.)

Striped states in weakly trapped ultracold Bose gases with Rashba
spin-orbit coupling
   [PDF]

Tomoki Ozawa, Gordon Baym
The striped state of ultracold bosons with Rashba spin-orbit coupling in a homogeneous infinite system has, as we show, a constant particle flow, which in a finite-size system would accumulate particles at the boundaries; it is thus not a physical steady state of the system. We propose, as a variational ansatz, a condensate wave function for a weakly trapped system which behaves similarly to the striped state near the center, but does not have particle flow at the boundaries. This state has a line of unquantized coreless vortices. We show, by minimizing the total energy, that our modified striped state has lower energy than the conventional striped state and it is thus a physically appropriate starting point to analyze striped states in finite systems.
View original: http://arxiv.org/abs/1204.6534

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