Properties of Bose gases with the Raman-induced spin-orbit coupling

Year: 2013

Authors: Zheng W., Zeng-Qiang Y., Cui XL., Zhai H.

Autors Affiliation: Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy; INO CNR BEC Ctr, I-38123 Povo, Italy.

Abstract: In this paper we investigate the properties of Bose gases with Raman-induced spin-orbit (SO) coupling. It is found that the SO coupling can greatly modify the single-particle density of state, and thus leads to the non-monotonic behaviour of the condensate depletion, the Lee-Huang-Yang correction of ground-state energy and the transition temperature of a non-interacting Bose-Einstein condensate (BEC). The presence of the SO coupling also breaks the Galilean invariance, and this gives two different critical velocities, corresponding to the movement of the condensate and the impurity respectively. Finally, we show that with the SO coupling, the interactions modify the BEC transition temperature even at the Hartree-Fock level, in contrast to the ordinary Bose gas without the SO coupling. All results presented here can be directly verified in the current cold atom experiments using the Raman laser-induced gauge field.

Journal/Review: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

Volume: 46 (13)      Pages from: 134007-1  to: 134007-10

KeyWords: Bose-Einstein condensates; Critical velocities; Density of state; Galilean invariance; Ground-state energies; Hartree-Fock levels; Single-particle; Spin-orbit couplings
DOI: 10.1088/0953-4075/46/13/134007

Citations: 97
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