Optical Detection of Long Electron Spin Transport Lengths in a Monolayer Semiconductor
Abstract
Using a spatially resolved optical pump-probe experiment, we measure the lateral transport of spin-valley polarized electrons over very long distances (tens of micrometers) in a single WSe2 monolayer. By locally pumping the Fermi sea of 2D electrons to a high degree of spin-valley polarization (up to 75%) using circularly polarized light, the lateral diffusion of the electron polarization can be mapped out via the photoluminescence induced by a spatially separated and linearly polarized probe laser. In this work, up to 25% spin-valley polarization is observed at pump-probe separations up to 20 μm. Characteristic spin-valley diffusion lengths of 18 ± 3 μm are revealed at low temperatures. The dependence on temperature, pump helicity, pump intensity, and electron density highlight the key roles played by spin relaxation time and pumping efficiency on polarized electron transport in monolayer semiconductors possessing spin-valley locking.
- Authors:
-
[1];
[2];
[3];
- Univ. of Toulouse (France); Institut National des Sciences Appliquées de Toulouse (INSA) (France); Centre National de la Recherche Scientifique (CNRS) (France)
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Laboratory Directed Research and Development (LDRD) Program; Agence Nationale de la Recherché (ANR); National Science Foundation (NSF); State of Florida
- OSTI Identifier:
- 1883153
- Report Number(s):
- LA-UR-22-21878
Journal ID: ISSN 0031-9007
- Grant/Contract Number:
- 89233218CNA000001; ANR-17-EURE-0009
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 129; Journal Issue: 2; 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; High Magnetic Field Science
Citation Formats
Ren, L., Lombez, L., Robert, C., Beret, D., Lagarde, D., Urbaszek, B., Renucci, P., Taniguchi, T., Watanabe, K., Crooker, Scott A., and Marie, X. Optical Detection of Long Electron Spin Transport Lengths in a Monolayer Semiconductor. United States: N. p., 2022.
Web. doi:10.1103/physrevlett.129.027402.
Ren, L., Lombez, L., Robert, C., Beret, D., Lagarde, D., Urbaszek, B., Renucci, P., Taniguchi, T., Watanabe, K., Crooker, Scott A., & Marie, X. Optical Detection of Long Electron Spin Transport Lengths in a Monolayer Semiconductor. United States. https://doi.org/10.1103/physrevlett.129.027402
Ren, L., Lombez, L., Robert, C., Beret, D., Lagarde, D., Urbaszek, B., Renucci, P., Taniguchi, T., Watanabe, K., Crooker, Scott A., and Marie, X. Tue .
"Optical Detection of Long Electron Spin Transport Lengths in a Monolayer Semiconductor". United States. https://doi.org/10.1103/physrevlett.129.027402. https://www.osti.gov/servlets/purl/1883153.
@article{osti_1883153,
title = {Optical Detection of Long Electron Spin Transport Lengths in a Monolayer Semiconductor},
author = {Ren, L. and Lombez, L. and Robert, C. and Beret, D. and Lagarde, D. and Urbaszek, B. and Renucci, P. and Taniguchi, T. and Watanabe, K. and Crooker, Scott A. and Marie, X.},
abstractNote = {Using a spatially resolved optical pump-probe experiment, we measure the lateral transport of spin-valley polarized electrons over very long distances (tens of micrometers) in a single WSe2 monolayer. By locally pumping the Fermi sea of 2D electrons to a high degree of spin-valley polarization (up to 75%) using circularly polarized light, the lateral diffusion of the electron polarization can be mapped out via the photoluminescence induced by a spatially separated and linearly polarized probe laser. In this work, up to 25% spin-valley polarization is observed at pump-probe separations up to 20 μm. Characteristic spin-valley diffusion lengths of 18 ± 3 μm are revealed at low temperatures. The dependence on temperature, pump helicity, pump intensity, and electron density highlight the key roles played by spin relaxation time and pumping efficiency on polarized electron transport in monolayer semiconductors possessing spin-valley locking.},
doi = {10.1103/physrevlett.129.027402},
journal = {Physical Review Letters},
number = 2,
volume = 129,
place = {United States},
year = {Tue Jul 05 00:00:00 EDT 2022},
month = {Tue Jul 05 00:00:00 EDT 2022}
}
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