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  Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics

Rees, D., Lu, B., Sun, Y., Manna, K., Özgür, R., Subedi, S., et al. (2021). Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics. Physical Review Letters, 127(15): 157405, pp. 1-6. doi:10.1103/PhysRevLett.127.157405.

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 Creators:
Rees, Dylan1, Author
Lu, Baozhu1, Author
Sun, Yue1, Author
Manna, Kaustuv2, Author              
Özgür, Rüstem1, Author
Subedi, Sujan1, Author
Borrmann, Horst3, Author              
Felser, Claudia4, Author              
Orenstein, J.1, Author
Torchinsky, Darius H.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Horst Borrmann, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863410              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Despite the fundamental nature of the edge state in topological physics, direct measurement of electronic and optical properties of the Fermi arcs of topological semimetals has posed a significant experimental challenge, as their response is often overwhelmed by the metallic bulk. However, laser-driven currents carried by surface and bulk states can propagate in different directions in nonsymmorphic crystals, allowing for the two components to be easily separated. Motivated by a recent theoretical prediction G. Chang et al., Phys. Rev. Lett. 124, 166404 (2020), we have measured the linear and circular photogalvanic effect currents deriving from the Fermi arcs of the nonsymmorphic, chiral Weyl semimetal RhSi over the 0.45-1.1 eV incident photon energy range. Our data are in good agreement with the predicted spectral shape of the circular photogalvanic effect as a function of photon energy, although the direction of the surface photocurrent departed from the theoretical expectation over the energy range studied. Surface currents arising from the linear photogalvanic effect were observed as well, with the unexpected result that only two of the six allowed tensor element were required to describe the measurements, suggesting an approximate emergent mirror symmetry inconsistent with the space group of the crystal.

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Language(s): eng - English
 Dates: 2021-10-082021-10-08
 Publication Status: Published in print
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 127 (15) Sequence Number: 157405 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1