We study an optical torque emerging through the interaction of orbital angular momentum with atoms/molecules in quantum systems with closed-loop interactions. First, we show how atoms with a closed-loop scheme experience a well-controlled torque whose features depend on the relative phase of applied fields. Such a controllable torque, along with simplicity of tuning the relative phase, can simplify the implementation of current flows in atomic Bose–Einstein condensates. Moreover, we calculate the optical torque exerted on chiral molecules with cyclic-transition structures and find that the enantiomers can experience different torques for proper choice of the parameters. Such features may find applications in sorting and separation of enantiomers.

中文翻译：

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随相位变化的光感应扭矩

我们研究了通过闭环相互作用的量子系统中原子/分子与轨道角动量的相互作用而产生的光学转矩。首先，我们展示了具有闭环方案的原子如何经受良好控制的转矩，其特征取决于所施加磁场的相对相位。如此可控制的扭矩，以及调整相对相位的简单性，可以简化原子Bose-Einstein凝聚物中电流的实现。此外，我们计算与环状过渡结构施加在手性分子的光扭矩，发现对映异构体可以为参数的适当选择经历不同的转矩。此类特征可在对映异构体的分选和分离中找到应用。