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arXiv 1701.08686cond-mat.quant-gas
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各向异性玻色-爱因斯坦凝聚体的朗道判据

Landau's criterion for an anisotropic Bose-Einstein condensate

Zeng-Qiang Yu

备注：
5 pages, 4 figures; published version
发表信息：
Phys. Rev. A 95, 033618 (2017)
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摘要：

本文讨论了各向异性超流性的朗道判据。为此，我们考虑一个点状杂质在均匀的玻色-爱因斯坦凝聚体中的运动，该凝聚体具有粒子间偶极-偶极相互作用或拉曼诱导的自旋-轨道耦合。在这两种情况下，我们发现，朗道临界速度$v_{\rm c}$一般小于声速的移动方向。在$v_{\rm c}$之外，通过微扰方法明确计算能量耗散率。在自旋轨道耦合玻色气体的平面波相位中，即使在与反冲动量正交的方向上，拉曼耦合也抑制了无耗散运动。我们的预言可以在超冷原子的实验中得到验证。

英文摘要：

In this work, we discuss the Landau's criterion for anisotropic superfluidity. To this end, we consider a point-like impurity moving in a uniform Bose-Einstein condensate with either interparticle dipole-dipole interaction or Raman induced spin-orbit coupling. In both cases, we find that the Landau critical velocity $v_{\rm c}$ is generally smaller than the sound velocity in the moving direction. Beyond $v_{\rm c}$, the energy dissipation rate is explicitly calculated via a perturbation approach. In the plane-wave phase of a spin-orbit coupled Bose gas, the dissipationless motion is suppressed by the Raman coupling even in the direction orthogonal to the recoil momentum. Our predictions can be tested in the experiments with ultracold atoms.

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