A quantum resonance model is prepared by periodically kicking cold atoms exposed to an optical ratchet potential in the direction of the gravitational field. Within tailored parameters, intriguing phenomena emerge including absolute negative mobility, in which the atom surprisingly moves against the bias (gravity). In its upward motion, the particle current can be less or greater than or equal to the zero-gravity case, for which current reversal may prevail. Contrary to its associated zero-gravity case, the particle can be fully trapped or can slowly move downward. These phenomena occur when the classical counterpart is chaotic. With the present-day optical-lattice setup, it will be interesting to observe all these phenomena and, in particular, to see how the atom flies uphill.

中文翻译：

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引力对冷原子量子共振棘轮输运的影响

量子共振模型是通过在引力场的方向上周期性地踢暴露于光学棘轮势的冷原子来准备的。在定制的参数中，出现了有趣的现象，包括绝对负迁移率，其中原子出人意料地逆着偏置（重力）移动。在其向上运动中，粒子电流可以小于或大于或等于零重力情况，对于这种情况，电流反转可能占优势。与其相关的零重力情况相反，粒子可以被完全捕获或可以缓慢向下移动。这些现象发生在经典对应物混乱时。使用当今的光学晶格装置，观察所有这些现象，特别是观察原子如何飞上山，将会很有趣。