平面超冷原子的光诱导有效磁场
Light induced effective magnetic fields for ultra-cold atoms in planar geometries
摘要：
我们提出了一个在平面几何中为超冷原子产生有效磁场的方案。该装置允许实验研究的经典和量子霍尔效应在密切类似的固态系统，包括有限的电流的可能性。本方案是Phys. Rev. Lett中提议的扩展。93，033602（2004），其中，现在通过具有移位空间轮廓的两个反向传播激光束对三能级λ型原子感生有效磁场。在电磁感应透明条件下，原子与光的相互作用存在一个空间相关的暗态，在此暗态下原子的绝热质心运动经历有效的矢量势和标量势。相关联的磁场垂直于激光束的传播方向定向。可实现的场强是在由横向光束间隔和激光波长给定的区域上的一个通量量子。对于一个足够稀释的气体的领域是强大的，足以达到最低的朗道能级制度。
英文摘要：
We propose a scheme to create an effective magnetic field for ultra-cold atoms in a planar geometry. The set-up allows the experimental study of classical and quantum Hall effects in close analogy to solid-state systems including the possibility of finite currents. The present scheme is an extention of the proposal in Phys. Rev. Lett. 93, 033602 (2004) where the effective magnetic field is now induced for three-level Lambda-type atoms by two counterpropagating laser beams with shifted spatial profiles. Under conditions of electromagentically induced transparency the atom-light interaction has a space dependent dark state, and the adiabatic center of mass motion of atoms in this state experiences effective vector and scalar potentials. The associated magnetic field is oriented perpendicular to the propagation direction of the laser beams. The field strength achievable is one flux quantum over an area given by the transverse beam separation and the laser wavelength. For a sufficiently dilute gas the field is strong enough to reach the lowest Landau level regime.
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