冷原子在非阿贝尔规范势中的双反射和负反射
Double and negative reflection of cold atoms in non-Abelian gauge potentials
摘要：
本文研究了与自旋1/2算符成正比的非阿贝尔矢量势作用下的原子反射。该势是由一个相对简单的激光配置的原子与三脚架水平计划。我们表明原子运动由两个不同的色散分支描述，具有正或负手征性。因此，原子反射显示出不寻常的特征，因为入射波可以在屏障处分裂成两个反射波，一个普通的镜面反射和一个附加的非镜面反射。值得注意的是，后一种波可以表现出负反射，并且如果入射角超过临界值，则可能变得渐逝。这些反射特性对于未来的非阿贝尔原子光学设计是至关重要的。
英文摘要：
Atom reflection is studied in the presence of a non-Abelian vector potential proportional to a spin-1/2 operator. The potential is produced by a relatively simple laser configuration for atoms with a tripod level scheme. We show that the atomic motion is described by two different dispersion branches with positive or negative chirality. As a consequence of that, atom reflection shows unusual features, since an incident wave may split into two reflected ones at a barrier, an ordinary specular reflection, and an additional non-specular one. Remarkably, the latter wave can exhibit negative reflection and may become evanescent if the angle of incidence exceeds a critical value. These reflection properties are crucial for future designs in non-Abelian atom optics.
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