Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points
Abstract
The chiral photocurrent or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, non-interacting 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 Hubbard 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 have a weaker dependence on the form of the cutoff than previously studied interaction corrections to the (non-topological) linear optical conductivity of graphene, and a potentially observable frequency dependence. Here, 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.
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1603638
- Grant/Contract Number:
- AC02-05CH11231; DMR-1918065
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 124; Journal Issue: 19; 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
Citation Formats
Avdoshkin, Alexander, Kozii, Vladyslav, and Moore, Joel E. Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points. United States: N. p., 2020.
Web. doi:10.1103/physrevlett.124.196603.
Avdoshkin, Alexander, Kozii, Vladyslav, & Moore, Joel E. Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points. United States. https://doi.org/10.1103/physrevlett.124.196603
Avdoshkin, Alexander, Kozii, Vladyslav, and Moore, Joel E. Fri .
"Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points". United States. https://doi.org/10.1103/physrevlett.124.196603. https://www.osti.gov/servlets/purl/1603638.
@article{osti_1603638,
title = {Interactions Remove the Quantization of the Chiral Photocurrent at Weyl Points},
author = {Avdoshkin, Alexander and Kozii, Vladyslav and Moore, Joel E.},
abstractNote = {The chiral photocurrent or circular photogalvanic effect (CPGE) is a photocurrent that depends on the sense of circular polarization. In a disorder-free, non-interacting 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 Hubbard 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 have a weaker dependence on the form of the cutoff than previously studied interaction corrections to the (non-topological) linear optical conductivity of graphene, and a potentially observable frequency dependence. Here, 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.},
doi = {10.1103/physrevlett.124.196603},
journal = {Physical Review Letters},
number = 19,
volume = 124,
place = {United States},
year = {Fri May 15 00:00:00 EDT 2020},
month = {Fri May 15 00:00:00 EDT 2020}
}
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