光晶格中三维布朗马达的特性
Characterisation of a three-dimensional Brownian motor in optical lattices
摘要：
本文详细研究了双光晶格中基于冷原子的三维布朗马达的行为[P.Sjolund et al.，物理修订版信函96，190602（2006）]。这包括布朗粒子的实验和数值模拟。所使用的电位是空间和时间对称的，但组合的时空对称性被电位之间的相移和不对称传输速率打破。原子在光晶格中的扩散在三维方向和速度上都受到整流和控制。我们探索了一个大范围的实验参数，其中的光晶格光的辐照度和失谐的耗散制度内变化。诱导漂移速度在一个原子反冲速度的顺序已经实现。
英文摘要：
We present here a detailed study of the behaviour of a three dimensional Brownian motor based on cold atoms in a double optical lattice [P. Sjolund et al., Phys. Rev. Lett. 96, 190602 (2006)]. This includes both experiments and numerical simulations of a Brownian particle. The potentials used are spatially and temporally symmetric, but combined spatiotemporal symmetry is broken by phase shifts and asymmetric transfer rates between potentials. The diffusion of atoms in the optical lattices is rectified and controlled both in direction and speed along three dimensions. We explore a large range of experimental parameters, where irradiances and detunings of the optical lattice lights are varied within the dissipative regime. Induced drift velocities in the order of one atomic recoil velocity have been achieved.
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