Unconventional Chiral Fermions and Large Topological Fermi Arcs in RhSi
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The theoretical proposal of chiral fermions in topological semimetals has led to a significant effort towards their experimental realization. In particular, the Fermi surfaces of chiral semimetals carry quantized Chern numbers, making them an attractive platform for the observation of exotic transport and optical phenomena. While the simplest example of a chiral fermion in condensed matter is a conventional |C|=1 Weyl fermion, recent theoretical works have proposed a number of unconventional chiral fermions beyond the standard model which are protected by unique combinations of topology and crystalline symmetries. However, materials candidates for experimentally probing the transport and response signatures of these unconventional fermions have thus far remained elusive. In this Letter, we propose the RhSi family in space group No. 198 as the ideal platform for the experimental examination of unconventional chiral fermions. We find that RhSi is a filling-enforced semimetal that features near its Fermi surface a chiral double sixfold-degenerate spin-1 Weyl node at R and a previously uncharacterized fourfold-degenerate chiral fermion at Γ. Each unconventional fermion displays Chern number ±4 at the Fermi level. We also show that RhSi displays the largest possible momentum separation of compensative chiral fermions, the largest proposed topologically nontrivial energy window, and the longest possible Fermi arcs on its surface. We conclude by proposing signatures of an exotic bulk photogalvanic response in RhSi.
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Within Weyl semimetals, measuring quantization in the injection photocurrent can only occur if nodes of opposite chirality are separated in energy, requiring an absence of mirror symmetry, as found in multifold chiral semimetals.
“Within the Weyl semimetals, this can only occur if nodes of opposite chirality are separated in energy, requiring an absence of mirror symmetry, as can be found in the class of chiral semimetals known as multifold compounds102–104.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [102]
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Weyl and Dirac Semimetals in Three Dimensional Solids
Armitage, N. P., Mele, E. J., & Vishwanath, A. (2017) · arXiv
“A particularly promising family of materials that is expected to combine multiple types of band touching and long Fermi-arcs on certain surfaces may be found in the AB material class (A = Co, Rh and B=Si, Ge) (Chang et al., 2017; Tang et al., 2017).”
BackgroundMethod
- Authors
- Chang, G., Xu, S.-Y., Wieder, B. J., Sanchez, D. S., Huang, S.-M., Belopolski, I., Chang, T.-R., Zhang, S., Bansil, A., Lin, H., & Hasan, M. Z.
- Affiliations
- National University of Singapore (SG)
- Princeton University (US)
- Stockholm University (SE)
- National Sun Yat-sen University (TW)
- National Cheng Kung University (TW)
- Northeastern University (US)
- Lawrence Berkeley National Laboratory (US)
- ORCID
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2017-11-17
- Volume
- 119
- Issue
- 20
- Pages
- 206401-206401
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2626588939
- Cited by
- 399
- References
- 57
- Citations by year
- 2026: 24 · 2025: 42 · 2024: 40 · 2023: 52 · 2022: 49 · 2021: 60 · 2020: 70 · 2019: 41 · 2018: 17 · 2017: 4
- FWCI
- 17.57
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Physical Review Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation (NSF-DMR-1507585, NSF-DMR-1006492)
- Division of Materials Research
- Gordon and Betty Moore Foundation (GBMF4547-HASAN)
- National Research Foundation Singapore (NRF-NRFF2013-03)
- U.S. Department of Energy (DE-FG02-07ER46352, DE-AC02-05CH11231)
- Office of Science
- Basic Energy Sciences
- Ministry of Science and Technology, Taiwan (MOST105-2112-M-110-014-MY3)
- National Cheng Kung University
- National Center for Theoretical Sciences
- 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, topological semimetals, Chern number, Fermi arcs, Weyl points
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