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Title: Fermi-arc-induced vortex structure in Weyl beam shifts
Authors: Chattopadhyay, Udvas
Shi, Li-kun
Zhang, Baile
Song, Justin Chien Wen
Chong, Yi Dong
Keywords: Topological Materials
Topological Effects in Photonic Systems
Issue Date: 2019
Source: Chattopadhyay, U., Shi, L., Zhang, B., Song, J. C. W., & Chong, Y. D. (2019). Fermi-arc-induced vortex structure in Weyl beam shifts. Physical Review Letters, 122(6), 066602-. doi:10.1103/PhysRevLett.122.066602
Series/Report no.: Physical Review Letters
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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.122.066602
DOI (Related Dataset):
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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