Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics
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. In conclusion, 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.
- Authors:
-
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Temple Univ., Philadelphia, PA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Indian Inst. of Technology (IIT), New Delhi (India)
- Univ. of California, Berkeley, CA (United States)
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Gordon and Betty Moore Foundation; National Science Foundation (NSF); European Research Council (ERC); European Union (EU); German Research Foundation (DFG)
- OSTI Identifier:
- 1901533
- Grant/Contract Number:
- AC02-05CH11231; GBMF4537; NSF/DMR-1945222; 742068 TOP-MAT; 824123; 766566; SFB 1143
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 127; Journal Issue: 15; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; edge states; Fermi surface; optical and microwave phenomena; photogalvanic effect; photoinduced effect; topological materials; topological phases of matter; Weyl fermions
Citation Formats
Rees, Dylan, Lu, Baozhu, Sun, Yue, Manna, Kaustuv, Özgür, Rüstem, Subedi, Sujan, Borrmann, Horst, Felser, Claudia, Orenstein, Joseph, and Torchinsky, Darius H. Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics. United States: N. p., 2021.
Web. doi:10.1103/physrevlett.127.157405.
Rees, Dylan, Lu, Baozhu, Sun, Yue, Manna, Kaustuv, Özgür, Rüstem, Subedi, Sujan, Borrmann, Horst, Felser, Claudia, Orenstein, Joseph, & Torchinsky, Darius H. Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics. United States. https://doi.org/10.1103/physrevlett.127.157405
Rees, Dylan, Lu, Baozhu, Sun, Yue, Manna, Kaustuv, Özgür, Rüstem, Subedi, Sujan, Borrmann, Horst, Felser, Claudia, Orenstein, Joseph, and Torchinsky, Darius H. Fri .
"Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics". United States. https://doi.org/10.1103/physrevlett.127.157405. https://www.osti.gov/servlets/purl/1901533.
@article{osti_1901533,
title = {Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics},
author = {Rees, Dylan and Lu, Baozhu and Sun, Yue and Manna, Kaustuv and Özgür, Rüstem and Subedi, Sujan and Borrmann, Horst and Felser, Claudia and Orenstein, Joseph and Torchinsky, Darius H.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1103/physrevlett.127.157405},
journal = {Physical Review Letters},
number = 15,
volume = 127,
place = {United States},
year = {Fri Oct 08 00:00:00 EDT 2021},
month = {Fri Oct 08 00:00:00 EDT 2021}
}
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