Spatial extent of the excited exciton states in monolayers from diamagnetic shifts
Abstract
Here, we experimentally study the radii of excitons in hBN-encapsulated WS2 monolayers by means of magneto-optical reflectance spectroscopy at cryogenic temperatures in magnetic fields up to 29 T. We observe field-induced energy shifts of the exciton ground and excited states due to valley Zeeman and diamagnetic effects. We find the g factor of the first excited state of –4.2 ± 0.1 to be essentially equal to that of the ground state of –4.35 ± 0.1. From diamagnetic shifts, we determine the root mean square radii of the excitons. The radius of the first excited state is found to be 5–8 nm and that of the ground state around 2 nm. Our results further confirm the Wannier-Mott nature of the exciton quasiparticles in monolayer semiconductors and the assignment of the optical resonances in absorption-type measurements. They also provide additional support for the applicability of the effective mass hydrogenlike models in these systems.
- Authors:
-
[3];
[3];
- Univ. of Regensburg, Regensburg (Germany)
- Radboud Univ., Nijmegen (The Netherlands)
- National High Magnetic Field Lab., Los Alamos, NM (United States)
- National Institute for Materials Science, Ibaraki (Japan)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1471368
- Report Number(s):
- LA-UR-18-27842
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 7; 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; High Magnetic Field Science
Citation Formats
Zipfel, Jonas, Holler, Johannes, Mitioglu, Anatolie A., Ballottin, Mariana V., Nagler, Philipp, Stier, Andreas V., Taniguchi, Takashi, Watanabe, Kenji, Crooker, Scott A., Christianen, Peter C. M., Korn, Tobias, and Chernikov, Alexey. Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.075438.
Zipfel, Jonas, Holler, Johannes, Mitioglu, Anatolie A., Ballottin, Mariana V., Nagler, Philipp, Stier, Andreas V., Taniguchi, Takashi, Watanabe, Kenji, Crooker, Scott A., Christianen, Peter C. M., Korn, Tobias, & Chernikov, Alexey. Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts. United States. https://doi.org/10.1103/PhysRevB.98.075438
Zipfel, Jonas, Holler, Johannes, Mitioglu, Anatolie A., Ballottin, Mariana V., Nagler, Philipp, Stier, Andreas V., Taniguchi, Takashi, Watanabe, Kenji, Crooker, Scott A., Christianen, Peter C. M., Korn, Tobias, and Chernikov, Alexey. Fri .
"Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts". United States. https://doi.org/10.1103/PhysRevB.98.075438. https://www.osti.gov/servlets/purl/1471368.
@article{osti_1471368,
title = {Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts},
author = {Zipfel, Jonas and Holler, Johannes and Mitioglu, Anatolie A. and Ballottin, Mariana V. and Nagler, Philipp and Stier, Andreas V. and Taniguchi, Takashi and Watanabe, Kenji and Crooker, Scott A. and Christianen, Peter C. M. and Korn, Tobias and Chernikov, Alexey},
abstractNote = {Here, we experimentally study the radii of excitons in hBN-encapsulated WS2 monolayers by means of magneto-optical reflectance spectroscopy at cryogenic temperatures in magnetic fields up to 29 T. We observe field-induced energy shifts of the exciton ground and excited states due to valley Zeeman and diamagnetic effects. We find the g factor of the first excited state of –4.2 ± 0.1 to be essentially equal to that of the ground state of –4.35 ± 0.1. From diamagnetic shifts, we determine the root mean square radii of the excitons. The radius of the first excited state is found to be 5–8 nm and that of the ground state around 2 nm. Our results further confirm the Wannier-Mott nature of the exciton quasiparticles in monolayer semiconductors and the assignment of the optical resonances in absorption-type measurements. They also provide additional support for the applicability of the effective mass hydrogenlike models in these systems.},
doi = {10.1103/PhysRevB.98.075438},
journal = {Physical Review B},
number = 7,
volume = 98,
place = {United States},
year = {Fri Aug 31 00:00:00 EDT 2018},
month = {Fri Aug 31 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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