Laser场诱导原子自旋轨道耦合效应
Effect of Induced Spin-Orbit Coupling for Atoms via Laser Fields
摘要：
提出了一个研究二维费米原子气云中自旋-轨道耦合效应的实验方案，通过将其内部电子态（赝自旋）耦合到δ组态的辐射中.诱导的自旋-轨道耦合可以是Dresselhaus和Rashba型，有或没有塞曼项。结果表明，在适当的条件下，光致自旋轨道耦合可以导致自旋相关的有效质量，其中一个有效质量可以在正负有效质量之间调节.作为一个直接的观察，我们表明，在原子云的膨胀动力学的初始原子云分裂成两个云的正有效质量的情况下政权，并为负有效质量政权的四个云。
英文摘要：
We propose an experimental scheme to study spin-orbit coupling effects in a of two-dimensional (2D) Fermi atomic gas cloud by coupling its internal electronic states (pseudospins) to radiation in a delta configuration. The induced spin-orbit coupling can be of the Dresselhaus and Rashba type with and without a Zeeman term. We show that the optically induced spin-orbit coupling can lead to a spin-dependent effective mass under appropriate condition, with one of them able to be tuned between positive and negative effective mass. As a direct observable we show that in the expansion dynamics of the atomic cloud the initial atomic cloud splits into two clouds for the positive effective mass case regime, and into four clouds for the negative effective mass regime.
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