Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal
Abstract
Solids with topologically robust electronic states exhibit unusual electronic and optical properties that do not exist in other materials. A particularly interesting example is chiral charge pumping, the so-called chiral anomaly, in recently discovered topological Weyl semimetals, where simultaneous application of parallel DC electric and magnetic fields creates an imbalance in the number of carriers of opposite topological charge (chirality). Here, using time-resolved terahertz measurements on the Weyl semimetal TaAs in a magnetic field, we optically interrogate the chiral anomaly by dynamically pumping the chiral charges and monitoring their subsequent relaxation of the nonequilibrium state. Theory based on Boltzmann transport shows that the observed effects originate from an optical nonlinearity in the chiral charge pumping process. Our measurements reveal that the nonequilibrium chiral excitation relaxation time is much greater than 1 ns. The observation of terahertz-controlled chiral carriers with long coherence times and topological protection suggests the application of Weyl semimetals for quantum optoelectronic technology.
- Authors:
-
[2];
[7];
- Columbia Univ., New York, NY (United States)
- Sharif University of Technology, Tehran (Iran)
- Univ. of Maryland, College Park, MD (United States); 4Universit¨at Duisburg-Essen, Duisburg (Germany)
- Univ. of Maryland, College Park, MD (United States); Science Systems and Applications, Inc. Lanham, MD (United States)
- Univ. of California, Los Angeles, CA (United States)
- Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
- Univ. of Maryland, College Park, MD (United States)
- Publication Date:
- Research Org.:
- Univ. of Maryland, College Park, MD (United States); Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1850939
- Grant/Contract Number:
- SC0005436; SC0011978
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 24; 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; Materials Science; Physics; Topological materials; Weyl semimetal; Boltzmann theory; Pump-probe spectroscopy
Citation Formats
Jadidi, M. Mehdi, Kargarian, Mehdi, Mittendorff, Martin, Aytac, Yigit, Shen, Bing, König-Otto, Jacob C., Winnerl, Stephan, Ni, Ni, Gaeta, Alexander L., Murphy, Thomas E., and Drew, H. Dennis. Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.245123.
Jadidi, M. Mehdi, Kargarian, Mehdi, Mittendorff, Martin, Aytac, Yigit, Shen, Bing, König-Otto, Jacob C., Winnerl, Stephan, Ni, Ni, Gaeta, Alexander L., Murphy, Thomas E., & Drew, H. Dennis. Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal. United States. https://doi.org/10.1103/physrevb.102.245123
Jadidi, M. Mehdi, Kargarian, Mehdi, Mittendorff, Martin, Aytac, Yigit, Shen, Bing, König-Otto, Jacob C., Winnerl, Stephan, Ni, Ni, Gaeta, Alexander L., Murphy, Thomas E., and Drew, H. Dennis. Wed .
"Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal". United States. https://doi.org/10.1103/physrevb.102.245123. https://www.osti.gov/servlets/purl/1850939.
@article{osti_1850939,
title = {Nonlinear optical control of chiral charge pumping in a topological Weyl semimetal},
author = {Jadidi, M. Mehdi and Kargarian, Mehdi and Mittendorff, Martin and Aytac, Yigit and Shen, Bing and König-Otto, Jacob C. and Winnerl, Stephan and Ni, Ni and Gaeta, Alexander L. and Murphy, Thomas E. and Drew, H. Dennis},
abstractNote = {Solids with topologically robust electronic states exhibit unusual electronic and optical properties that do not exist in other materials. A particularly interesting example is chiral charge pumping, the so-called chiral anomaly, in recently discovered topological Weyl semimetals, where simultaneous application of parallel DC electric and magnetic fields creates an imbalance in the number of carriers of opposite topological charge (chirality). Here, using time-resolved terahertz measurements on the Weyl semimetal TaAs in a magnetic field, we optically interrogate the chiral anomaly by dynamically pumping the chiral charges and monitoring their subsequent relaxation of the nonequilibrium state. Theory based on Boltzmann transport shows that the observed effects originate from an optical nonlinearity in the chiral charge pumping process. Our measurements reveal that the nonequilibrium chiral excitation relaxation time is much greater than 1 ns. The observation of terahertz-controlled chiral carriers with long coherence times and topological protection suggests the application of Weyl semimetals for quantum optoelectronic technology.},
doi = {10.1103/physrevb.102.245123},
journal = {Physical Review. B},
number = 24,
volume = 102,
place = {United States},
year = {Wed Dec 16 00:00:00 EST 2020},
month = {Wed Dec 16 00:00:00 EST 2020}
}
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