利用磁场梯度脉冲合成原子自旋轨道耦合
Atomic spin-orbit coupling synthesized with magnetic-field-gradient pulses
摘要：
我们讨论了一个一般的计划，用于创建原子自旋轨道耦合（SOC），如Rashba或Dresselhaus类型使用磁场梯度脉冲。与传统的基于绝热质心运动的方案不同，我们的方案利用原子磁矩与外部磁场之间的耦合，适用于超精细自旋流形的完整子空间.空间相关的脉冲磁场作为内部状态相关的脉冲，从而将原子内部自旋与其轨道质心运动耦合，如爱因斯坦-德哈斯效应。可以动态地操纵这种有效的耦合以合成任何类型的SOC（Rashba、Dresselhaus或其任何线性组合）。我们的方案可以实现与大多数实验设置的超冷原子，特别是适用于原子核自旋为零。
英文摘要：
We discuss a general scheme for creating atomic spin-orbit coupling (SOC) such as the Rashba or Dresselhaus types using magnetic-field-gradient pulses. In contrast to conventional schemes based on adiabatic center-of-mass motion with atomic internal states restricted to a dressed-state subspace, our scheme works for the complete subspace of a hyperfine-spin manifold by utilizing the coupling between the atomic magnetic moment and external magnetic fields. A spatially dependent pulsed magnetic field acts as an internal-state-dependent impulse, thereby coupling the atomic internal spin with its orbital center-of-mass motion, as in the Einstein-de Haas effect. This effective coupling can be dynamically manipulated to synthesize SOC of any type (Rashba, Dresselhaus, or any linear combination thereof). Our scheme can be realized with most experimental setups of ultracold atoms and is especially suited for atoms with zero nuclear spins.
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