倾斜偶极子的二维玻色气体：Roton不稳定性和凝析亏损
Two-dimensional Bose gas of tilted dipoles: roton instability and condensate depletion
摘要：
我们预测了在一个单一的均匀量子层中的二维弱相互作用倾斜偶极子气体的旋转不稳定性的效果。作为强关联系统的典型，旋转子现象似乎发生在弱相互作用气体中。重要的是，在一个系统的正常到宽层偶极子，打破旋转对称性的倾斜偶极子系统导致的凝聚耗尽的收敛，甚至达到阈值的roton不稳定性，与平均场的方法是有效的。预测的效果可以在广泛的一类偶极系统中观察到。我们建议在光晶格中观察超冷原子和极性分子系统的预言现象，并估计最佳的实验参数。
英文摘要：
We predict the effect of the roton instability for a two-dimensional weakly interacting gas of tilted dipoles in a single homogeneous quantum layer. Being typical for strongly correlated systems, the roton phenomena appear to occur in a weakly interacting gas. It is important that in contrast to a system of normal to wide layer dipoles, breaking of the rotational symmetry for a system of tilted dipoles leads to the convergence of the condensate depletion even up to the threshold of the roton instability, with mean-field approach being valid. Predicted effects can be observed in a wide class of dipolar systems. We suggest observing predicted phenomena for systems of ultracold atoms and polar molecules in optical lattices, and estimate optimal experimental parameters.
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