In this paper, we consider the effect of a uniform gravitational field on a spin-orbit coupled Bose gas. In a semiclassical approximation, we find that the gravitational field triggers Bose-Einstein condensation at finite temperature. For weak gravitational field, the critical temperature increases as the gravitational field goes more intense. And it first increases and then decreases along with increasing spin-orbit coupling strength. The heat capacity of the Bose gas varies continuously with the temperature around the critical one, which is different from the one in cases without a spin-orbit coupling.

中文翻译：

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自旋轨道耦合玻色气体在均匀引力场中的凝结

在本文中，我们考虑了均匀重力场对自旋轨道耦合玻色气体的影响。在半经典近似中，我们发现重力场在有限温度下触发了玻色-爱因斯坦凝聚。对于弱引力场，临界温度随着引力场变得更强而升高。并且它随着自旋轨道耦合强度的增加先增加然后减少。玻色气体的热容随临界温度附近的温度连续变化，这与没有自旋轨道耦合的情况不同。