Magnetic photocurrents in multifold Weyl fermions
Abstract
Here, we examine the magneto-optical response of chiral multifold fermions. Specifically, we show that they are ideal candidates for observing the helical magnetic effect (HME) previously predicted for simple Weyl fermions. Unlike Weyl fermions, the HME is present in multifold fermions even in the simplest case where the low-energy dispersion is linear and spherically symmetric. In this ideal case, we derive an analytical expression for the HME and find it is proportional to the circular photogalvanic effect; for realistic parameters and accounting for the geometry of the setup, the HME photocurrent could be roughly the same order of magnitude as the circular photogalvanic effect observed in multifold fermions. Additional nonlinear and symmetry-breaking terms will ruin the quantization but not hurt the observation of the HME.
- Authors:
-
- Stony Brook Univ., NY (United States)
- Stony Brook Univ., NY (United States); Flatiron Institute, New York, NY (United States)
- Publication Date:
- Research Org.:
- Stony Brook Univ., NY (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1846667
- Grant/Contract Number:
- SC0017662
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Chirality; Magneto-optical effect; Photonics; Weyl fermions; Topological materials; Weyl semimetal; Chiral symmetry
Citation Formats
Kaushik, Sahal, and Cano, Jennifer. Magnetic photocurrents in multifold Weyl fermions. United States: N. p., 2021.
Web. doi:10.1103/physrevb.104.155149.
Kaushik, Sahal, & Cano, Jennifer. Magnetic photocurrents in multifold Weyl fermions. United States. https://doi.org/10.1103/physrevb.104.155149
Kaushik, Sahal, and Cano, Jennifer. Wed .
"Magnetic photocurrents in multifold Weyl fermions". United States. https://doi.org/10.1103/physrevb.104.155149. https://www.osti.gov/servlets/purl/1846667.
@article{osti_1846667,
title = {Magnetic photocurrents in multifold Weyl fermions},
author = {Kaushik, Sahal and Cano, Jennifer},
abstractNote = {Here, we examine the magneto-optical response of chiral multifold fermions. Specifically, we show that they are ideal candidates for observing the helical magnetic effect (HME) previously predicted for simple Weyl fermions. Unlike Weyl fermions, the HME is present in multifold fermions even in the simplest case where the low-energy dispersion is linear and spherically symmetric. In this ideal case, we derive an analytical expression for the HME and find it is proportional to the circular photogalvanic effect; for realistic parameters and accounting for the geometry of the setup, the HME photocurrent could be roughly the same order of magnitude as the circular photogalvanic effect observed in multifold fermions. Additional nonlinear and symmetry-breaking terms will ruin the quantization but not hurt the observation of the HME.},
doi = {10.1103/physrevb.104.155149},
journal = {Physical Review. B},
number = 15,
volume = 104,
place = {United States},
year = {Wed Oct 27 00:00:00 EDT 2021},
month = {Wed Oct 27 00:00:00 EDT 2021}
}
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