界面反射异常位移的量子化循环
Quantized Circulation of Anomalous Shift in Interface Reflection
摘要：
当粒子束在界面处被反射时，粒子束可能经历异常的空间移位。这种位移形成了在二维界面动量空间中定义的矢量场。我们表明，虽然在个别动量的位移矢量通常是敏感的系统的细节，其积分沿闭环，即，它的循环，可以在某些感兴趣的对称条件下产生鲁棒的量化数。特别是当光束从平凡介质入射时，反常位移的量子化循环直接反映了另一介质的拓扑特征。我们证明，Weyl介质的拓扑电荷以及超导体的非常规对势可以捕获和区分CAS。我们的工作揭示了无处不在的物理过程中隐藏的量子化特征，这也可能为探索拓扑介质提供一种新的方法。
英文摘要：
A particle beam may undergo an anomalous spatial shift when it is reflected at an interface. The shift forms a vector field defined in the two-dimensional interface momentum space. We show that, although the shift vector at individual momentum is typically sensitive to the system details, its integral along a close loop, i.e., its circulation, could yield a robust quantized number under certain symmetry conditions of interest. Particularly, this is the case when the beam is incident from a trivial medium, then the quantized circulation of anomalous shift (CAS) directly manifests the topological character of the other medium. We demonstrate that the topological charge of a Weyl medium as well as the unconventional pair potentials of a superconductor can be captured and distinguished by CAS. Our work unveils a hidden quantized feature in a ubiquitous physical process, which may also offer a new approach for probing topological media.
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