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arXiv 1203.6367cond-mat.quant-gas
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具有Rashba自旋轨道耦合的超冷原子玻色凝聚体对量子涨落和热涨落的稳定性

Stability of ultracold atomic Bose condensates with Rashba spin-orbit coupling against quantum and thermal fluctuations

Tomoki Ozawa, Gordon Baym

摘要:

我们研究了具有Rashba-Dresselhaus自旋轨道耦合的玻色凝聚体在三维空间中对量子涨落和热涨落的稳定性。正如我们所证明的,由于量子涨落引起的平面波凝聚体的基态损耗是有限的,因此凝聚体是稳定的。我们还计算了相应的基态能量的移动。虽然该系统不能凝聚在没有粒子间的相互作用,我们通过估计激发粒子的相互作用稳定的冷凝物,即使在非零温度的数量。与通常的玻色气体不同,正相在任何温度下都不是运动学禁戒的,通过计算有限温度下正相的自由能,并与凝聚态的自由能进行比较,我们推断系统一般在零温度下是凝聚态,在非零温度下经历向正相的转变.

英文摘要:

We study the stability of Bose condensates with Rashba-Dresselhaus spin-orbit coupling in three dimensions against quantum and thermal fluctuations. The ground state depletion of the plane-wave condensate due to quantum fluctuations is, as we show, finite, and therefore the condensate is stable. We also calculate the corresponding shift of the ground state energy. Although the system cannot condense in the absence of interparticle interactions, we show by estimating the number of excited particles that interactions stabilize the condensate even at non-zero temperature. Unlike in the usual Bose gas, the normal phase is not kinematically forbidden at any temperature; calculating the free energy of the normal phase at finite temperature, and comparing with the free energy of the condensed state, we infer that generally the system is condensed at zero temperature, and undergoes a transition to normal at non-zero temperature.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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