Fermi arc induced vortex structure in Weyl beam shifts

Abstract

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-Hänchen 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.

arXiv comment5+8 pages, 3+4 figures

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Cited by in corpus (4)

• Quantized Circulation of Anomalous Shift in Interface Reflection
• Shift vector as the geometric origin of beam shifts
• Phonon-limited Transport and Fermi Arc Lifetime in Weyl Semimetals
• Electron beam splitting at topological insulator surface states and a proposal for electronic Goos-Hanchen shift measurement