Direct Measurement of Helicoid Surface States in RhSi Using Nonlinear Optics
Open accessAbstract
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)PRLTAO0031-900710.1103/PhysRevLett.124.166404, 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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An emergent mirror symmetry at the surface of RhSi is inconsistent with its magnetic point group.
“the observation of an emergent mirror symmetry at the surface of RhSi that is inconsistent with its magnetic point group.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [108]
The main text reports that the surface-current measurements suggest an approximate emergent mirror symmetry inconsistent with RhSi’s space group. The claim omits the paper’s qualification that the symmetry is approximate and substitutes “magnetic point group” for the space group discussed in our copy. Page numbers were not supplied. (LLM, conf=0.85)
Experimental — accuracy not yet measuredIn the multifold compound RhSi, surface shift and injection currents have been distinguished from their bulk counterparts on the basis of symmetry.
“This has been experimentally verified in the multifold compound RhSi, where surface shift and injection currents have been distinguished from their bulk counterparts on the basis of symmetry108.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [108]
The main text reports that bulk symmetry forbids in-plane linear and circular photogalvanic currents under the experimental geometry, while surface currents are allowed and observed. It does not identify those currents specifically as shift and injection currents, so the claim's mechanistic labels are not established by this paper. (LLM, conf=0.85)
Experimental — accuracy not yet measured
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Cited by
Sorted by citations
Ultrafast terahertz emission from emerging symmetry-broken materials
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- Authors
- Rees, D., Lu, B., Sun, Y., Manna, K., Özgür, R., Subedi, S., Borrmann, H., Felser, C., Orenstein, J., & Torchinsky, D. H.
- Affiliations
- Lawrence Berkeley National Laboratory (US)
- Temple University (US)
- Max Planck Institute for Chemical Physics of Solids (DE)
- University of California, Berkeley (US)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2021-10-08
- Volume
- 127
- Issue
- 15
- Pages
- 157405-157405
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W3137562415
- Cited by
- 31
- References
- 47
- Citations by year
- 2026: 3 · 2025: 8 · 2024: 5 · 2023: 10 · 2022: 4 · 2021: 1
- FWCI
- 2.16
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion, cc-by-nc)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- Office of Science
- Basic Energy Sciences
- Division of Materials Sciences and Engineering
- U.S. Department of Energy (DE-AC02-05CH11231)
- Gordon and Betty Moore Foundation (GBMF4537)
- Temple University
- National Science Foundation (NSF/DMR-1945222)
- H2020 European Research Council (742068)
- Horizon 2020 Framework Programme (824123, 766566)
- Deutsche Forschungsgemeinschaft (SFB 1143)
- Max-Planck-Gesellschaft
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Materials Science › Materials Chemistry › 2D Materials and Applications
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Keywords
- RhSi, Fermi arcs, circular photogalvanic effect, linear photogalvanic effect, photon energy dependence
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