Double and negative reflection of cold atoms in non-Abelian gauge potentials
Double and negative reflection of cold atoms in non-Abelian gauge potentials
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DOI：
10.1103/physrevlett.100.200405
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发表时间：
2008-05-23
影响因子：
8.6
通讯作者：
Oehberg, Patrik
中科院分区：
文献类型：
--
作者：
Juzeliunas, Gediminas;Ruseckas, Julius;Oehberg, Patrik
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。我们证明了原子的运动可以用正负手征的两个色散分支来描述。因此，原子反射显示出不寻常的功能，因为入射波可能会分裂成两个反射的障碍，一个普通的镜面反射，和一个额外的非镜面反射。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。
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, 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 nonspecular 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.