晶格形貌对三维可控布朗马达的影响
Influence of the lattice topography on a three-dimensional, controllable Brownian motor
摘要：
研究了双光晶格中冷原子三维布朗马达的晶格形貌和不同方向运动之间的耦合对马达性能的影响。由于晶格之间的相对空间相位可控，我们的布朗马达可以诱导任意方向的漂移。由于晶格耦合不同的方向，相移和诱导漂移的方向性之间的关系是不平凡的。因此，通过系统地改变二维中的相对空间相位，同时监测垂直感应漂移和温度，实验研究了这种关系。覆盖2pi X 2pi的相对空间相位范围。我们表明，漂移，可控的速度和方向，可以实现，通过改变相位平行和垂直于所测量的诱导漂移的方向。实验结果定性再现的简化，经典模型的系统的数值模拟。
英文摘要：
We study the influence of the lattice topography and the coupling between motion in different directions, for a three-dimensional Brownian motor based on cold atoms in a double optical lattice. Due to controllable relative spatial phases between the lattices, our Brownian motor can induce drifts in arbitrary directions. Since the lattices couple the different directions, the relation between the phase shifts and the directionality of the induced drift is non trivial. Here is therefore this relation investigated experimentally by systematically varying the relative spatial phase in two dimensions, while monitoring the vertically induced drift and the temperature. A relative spatial phase range of 2pi x 2pi is covered. We show that a drift, controllable both in speed and direction, can be achieved, by varying the phase both parallel and perpendicular to the direction of the measured induced drift. The experimental results are qualitatively reproduced by numerical simulations of a simplified, classical model of the system.
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