Giant photocurrent in asymmetric Weyl semimetals from the helical magnetic effect
Abstract
We propose a new type of photoresponse induced in asymmetric Weyl semimetals in an external magnetic field. In usual symmetric Weyl semimetals in a magnetic field, the particles and holes produced by an incident light in different Weyl cones have opposite helicities and hence move in opposite directions, canceling each others's contributions to the photocurrent. However this cancelation does not occur if the Weyl semimetal possesses both a broken particle-hole symmetry and a broken spatial inversion symmetry. We call the resulting generation of photocurrent the helical magnetic effect because it is induced by the helicity imbalance in a magnetic field. We find that due to the large density of states in a magnetic field, the helical magnetic effect induces a remarkable large photocurrent for incident THz frequency light. This suggests a potential application of asymmetric Weyl semimetals for creating THz photosensors.
- Authors:
-
- Stony Brook Univ., NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
- Brookhaven National Lab. (BNL), Upton, NY (United States). RIKEN Research Center
- Univ. of Wurzburg (Germany)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1466631
- Alternate Identifier(s):
- OSTI ID: 1461004
- Report Number(s):
- BNL-207982-2018-JAAM
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- SC0012704; FG-88ER40388; SC-0017662; AC02-98CH10886
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 1; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Kharzeev, Dmitri E., Kikuchi, Yuta, Meyer, René, and Tanizaki, Yuya. Giant photocurrent in asymmetric Weyl semimetals from the helical magnetic effect. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.014305.
Kharzeev, Dmitri E., Kikuchi, Yuta, Meyer, René, & Tanizaki, Yuya. Giant photocurrent in asymmetric Weyl semimetals from the helical magnetic effect. United States. https://doi.org/10.1103/PhysRevB.98.014305
Kharzeev, Dmitri E., Kikuchi, Yuta, Meyer, René, and Tanizaki, Yuya. Thu .
"Giant photocurrent in asymmetric Weyl semimetals from the helical magnetic effect". United States. https://doi.org/10.1103/PhysRevB.98.014305. https://www.osti.gov/servlets/purl/1466631.
@article{osti_1466631,
title = {Giant photocurrent in asymmetric Weyl semimetals from the helical magnetic effect},
author = {Kharzeev, Dmitri E. and Kikuchi, Yuta and Meyer, René and Tanizaki, Yuya},
abstractNote = {We propose a new type of photoresponse induced in asymmetric Weyl semimetals in an external magnetic field. In usual symmetric Weyl semimetals in a magnetic field, the particles and holes produced by an incident light in different Weyl cones have opposite helicities and hence move in opposite directions, canceling each others's contributions to the photocurrent. However this cancelation does not occur if the Weyl semimetal possesses both a broken particle-hole symmetry and a broken spatial inversion symmetry. We call the resulting generation of photocurrent the helical magnetic effect because it is induced by the helicity imbalance in a magnetic field. We find that due to the large density of states in a magnetic field, the helical magnetic effect induces a remarkable large photocurrent for incident THz frequency light. This suggests a potential application of asymmetric Weyl semimetals for creating THz photosensors.},
doi = {10.1103/PhysRevB.98.014305},
journal = {Physical Review B},
number = 1,
volume = 98,
place = {United States},
year = {Thu Jul 19 00:00:00 EDT 2018},
month = {Thu Jul 19 00:00:00 EDT 2018}
}
Web of Science
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