Measurement of Conduction and Valence Bands -Factors in a Transition Metal Dichalcogenide Monolayer
Abstract
The electron valley and spin degree of freedom in monolayer transition-metal dichalcogenides can be manipulated in optical and transport measurements performed in magnetic fields. The key parameter for determining the Zeeman splitting, namely, the separate contribution of the electron and hole g factor, is inaccessible in most measurements. Here we present an original method that gives access to the respective contribution of the conduction and valence band to the measured Zeeman splitting. It exploits the optical selection rules of exciton complexes, in particular the ones involving intervalley phonons, avoiding strong renormalization effects that compromise single particle g -factor determination in transport experiments. These studies yield a direct determination of single band g factors. We measure gc1 = 0.86 ± 0.1, gc2 = 3.84 ± 0.1 for the bottom (top) conduction bands and gv = 6.1 ± 0.1 for the valence band of monolayer WSe2. These measurements are helpful for quantitative interpretation of optical and transport measurements performed in magnetic fields. In addition, the measured g factors are valuable input parameters for optimizing band structure calculations of these 2D materials.
- Authors:
-
- Univ. of Toulouse (France)
- Univ. of Rochester, NY (United States)
- National Institute for Materials Science (NIMS), Tsukuba (Japan)
- Publication Date:
- Research Org.:
- Univ. of Rochester, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1851898
- Grant/Contract Number:
- SC0014349
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 126; Journal Issue: 6; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Physics; Spin-orbit couplingValleytronics; Transition metal dichalcogenides
Citation Formats
Robert, C., Dery, H., Ren, L., Van Tuan, D., Courtade, E., Yang, M., Urbaszek, B., Lagarde, D., Watanabe, K., Taniguchi, T., Amand, T., and Marie, X. Measurement of Conduction and Valence Bands g-Factors in a Transition Metal Dichalcogenide Monolayer. United States: N. p., 2021.
Web. doi:10.1103/physrevlett.126.067403.
Robert, C., Dery, H., Ren, L., Van Tuan, D., Courtade, E., Yang, M., Urbaszek, B., Lagarde, D., Watanabe, K., Taniguchi, T., Amand, T., & Marie, X. Measurement of Conduction and Valence Bands g-Factors in a Transition Metal Dichalcogenide Monolayer. United States. https://doi.org/10.1103/physrevlett.126.067403
Robert, C., Dery, H., Ren, L., Van Tuan, D., Courtade, E., Yang, M., Urbaszek, B., Lagarde, D., Watanabe, K., Taniguchi, T., Amand, T., and Marie, X. Wed .
"Measurement of Conduction and Valence Bands g-Factors in a Transition Metal Dichalcogenide Monolayer". United States. https://doi.org/10.1103/physrevlett.126.067403. https://www.osti.gov/servlets/purl/1851898.
@article{osti_1851898,
title = {Measurement of Conduction and Valence Bands g-Factors in a Transition Metal Dichalcogenide Monolayer},
author = {Robert, C. and Dery, H. and Ren, L. and Van Tuan, D. and Courtade, E. and Yang, M. and Urbaszek, B. and Lagarde, D. and Watanabe, K. and Taniguchi, T. and Amand, T. and Marie, X.},
abstractNote = {The electron valley and spin degree of freedom in monolayer transition-metal dichalcogenides can be manipulated in optical and transport measurements performed in magnetic fields. The key parameter for determining the Zeeman splitting, namely, the separate contribution of the electron and hole g factor, is inaccessible in most measurements. Here we present an original method that gives access to the respective contribution of the conduction and valence band to the measured Zeeman splitting. It exploits the optical selection rules of exciton complexes, in particular the ones involving intervalley phonons, avoiding strong renormalization effects that compromise single particle g -factor determination in transport experiments. These studies yield a direct determination of single band g factors. We measure gc1 = 0.86 ± 0.1, gc2 = 3.84 ± 0.1 for the bottom (top) conduction bands and gv = 6.1 ± 0.1 for the valence band of monolayer WSe2. These measurements are helpful for quantitative interpretation of optical and transport measurements performed in magnetic fields. In addition, the measured g factors are valuable input parameters for optimizing band structure calculations of these 2D materials.},
doi = {10.1103/physrevlett.126.067403},
journal = {Physical Review Letters},
number = 6,
volume = 126,
place = {United States},
year = {Wed Feb 10 00:00:00 EST 2021},
month = {Wed Feb 10 00:00:00 EST 2021}
}
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