物理
望远镜
涡流
弧(几何)
缩放比例
凝聚态物理
曲面(拓扑)
梁(结构)
表面状态
几何学
光学
数学
热力学
作者
Udvas Chattopadhyay,Li-kun Shi,Baile Zhang,Justin C. W. Song,Yidong Chong
标识
DOI:10.1103/physrevlett.122.066602
摘要
In periodic media, despite the close relationship between geometrical effects in the bulk and topological surface states, the two are typically probed separately. We show that when beams in a Weyl medium reflect off an interface with a gapped medium, the trajectory is influenced by both bulk geometrical effects and the Fermi arc surface states. The reflected beam experiences a displacement, analogous to the Goos-H\"anchen or Imbert-Fedorov shifts, that forms a half-vortex in the two-dimensional surface momentum space. The half-vortex is centered where the Fermi arc of the reflecting surface touches the Weyl cone, with the magnitude of the shift scaling as an inverse square root away from the touching-point, and diverging at the touching-point. This striking feature provides a way to use bulk transport to probe the topological characteristics of a Weyl medium.
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