Photoinduced anomalous Hall effect in two-dimensional transition metal dichalcogenides
Abstract
A circularly polarized ac pump field illuminated near resonance on two-dimensional transition metal dichalcogenides (TMDs) produces an anomalous Hall effect in response to a dc bias field. In this work, we develop a theory for this photoinduced anomalous Hall effect in undoped TMDs irradiated by a strong coherent laser field. The strong field renormalizes the equilibrium bands and opens up a dynamical energy gap where single-photon resonance occurs. The resulting photon dressed states, or Floquet states, are treated within the rotating-wave approximation. A quantum kinetic equation approach is developed to study the nonequilibrium density matrix and time-averaged transport currents under the simultaneous influence of the strong ac pump field and the weak dc probe field. Dissipative effects are taken into account in the kinetic equation that captures relaxation and dephasing. The photoinduced longitudinal and Hall conductivities display notable resonant signatures when the pump field frequency reaches the spin-split interband transition energies. Rather than valley polarization, we find that the anomalous Hall current is mainly driven by the intraband response of photon-dressed electron populations near the dynamical gap at both valleys, accompanied by a smaller contribution due to the interband response. In conclusion, these findings highlight the importance of photon-dressed bandsmore »
- Publication Date:
- Research Org.:
- Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1772000
- Grant/Contract Number:
- SC0019326
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 103; Journal Issue: 12; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; anomalous Hall effect; two-dimensional transition metal dichalcogenides; valleytronics; productivity; ultrafast magnetic effects
Citation Formats
Nguyen, Phuong X., and Tse, Wang-Kong. Photoinduced anomalous Hall effect in two-dimensional transition metal dichalcogenides. United States: N. p., 2021.
Web. doi:10.1103/physrevb.103.125420.
Nguyen, Phuong X., & Tse, Wang-Kong. Photoinduced anomalous Hall effect in two-dimensional transition metal dichalcogenides. United States. https://doi.org/10.1103/physrevb.103.125420
Nguyen, Phuong X., and Tse, Wang-Kong. Mon .
"Photoinduced anomalous Hall effect in two-dimensional transition metal dichalcogenides". United States. https://doi.org/10.1103/physrevb.103.125420. https://www.osti.gov/servlets/purl/1772000.
@article{osti_1772000,
title = {Photoinduced anomalous Hall effect in two-dimensional transition metal dichalcogenides},
author = {Nguyen, Phuong X. and Tse, Wang-Kong},
abstractNote = {A circularly polarized ac pump field illuminated near resonance on two-dimensional transition metal dichalcogenides (TMDs) produces an anomalous Hall effect in response to a dc bias field. In this work, we develop a theory for this photoinduced anomalous Hall effect in undoped TMDs irradiated by a strong coherent laser field. The strong field renormalizes the equilibrium bands and opens up a dynamical energy gap where single-photon resonance occurs. The resulting photon dressed states, or Floquet states, are treated within the rotating-wave approximation. A quantum kinetic equation approach is developed to study the nonequilibrium density matrix and time-averaged transport currents under the simultaneous influence of the strong ac pump field and the weak dc probe field. Dissipative effects are taken into account in the kinetic equation that captures relaxation and dephasing. The photoinduced longitudinal and Hall conductivities display notable resonant signatures when the pump field frequency reaches the spin-split interband transition energies. Rather than valley polarization, we find that the anomalous Hall current is mainly driven by the intraband response of photon-dressed electron populations near the dynamical gap at both valleys, accompanied by a smaller contribution due to the interband response. In conclusion, these findings highlight the importance of photon-dressed bands and nonequilibrium distribution functions in achieving a proper understanding of the photoinduced anomalous Hall effect in a strong pump field.},
doi = {10.1103/physrevb.103.125420},
journal = {Physical Review. B},
number = 12,
volume = 103,
place = {United States},
year = {Mon Mar 22 00:00:00 EDT 2021},
month = {Mon Mar 22 00:00:00 EDT 2021}
}
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