Cited by 78Topological Materials and Phenomena2D Materials and ApplicationsAdvanced Condensed Matter Physics

Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points

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Avdoshkin, Alexander, Kozii, Vladyslav, Moore, Joel E.·2020·Physical Review Letters

Abstract

The chiral photocurrent or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, noninteracting chiral Weyl semimetal, the magnitude of the effect is approximately quantized with a material-independent quantum e^{3}/h^{2} for reasons of band topology. We study the first-order corrections due to the Coulomb and Hubbatrd interactions in a continuum model of a Weyl semimetal in which known corrections from other bands are absent. We find that the inclusion of interactions generically breaks the quantization. The corrections are similar but larger in magnitude than previously studied interaction corrections to the (nontopological) linear optical conductivity of graphene, and have a potentially observable frequency dependence. We conclude that, unlike the quantum Hall effect in gapped phases or the chiral anomaly in field theories, the quantization of the CPGE in Weyl semimetals is not protected but has perturbative corrections in interaction strength.

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Crossref · 10.1103/physrevlett.124.196603

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  • Quantization can be readily degraded by perturbative contributions from disorder and electron interactions.

    “quantization can be readily degraded by perturbative contributions from disorder and electron interactions105”

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Authors
Avdoshkin, A., Kozii, V., & Moore, J. E.
Affiliations
  • University of California, Berkeley (US)
  • Lawrence Berkeley National Laboratory (US)
Venue
Physical Review Letters
Published
2020-05-15
Volume
124
Issue
19
Pages
196603-196603
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W3027127232
Cited by
78
References
56
Citations by year
2026: 9 · 2025: 14 · 2024: 14 · 2023: 9 · 2022: 7 · 2021: 17 · 2020: 8
FWCI
4.17
Type
journal article
Language
en
Open access
Locations
  • Physical Review Letters (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • U.S. Department of Energy (DE-AC02-05CH11231)
  • National Science Foundation (DMR-1918065)
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
circular photogalvanic effect, Weyl semimetals, Weyl points, electrostatic interactions, Hubbard interaction, first-order correction, band topology, continuum model

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