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Title: Spatial extent of the excited exciton states in WS 2 monolayers from diamagnetic shifts

Abstract

Here, we experimentally study the radii of excitons in hBN-encapsulated WS 2 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:
 [1];  [1];  [2];  [2];  [1]; ORCiD logo [3];  [4];  [4]; ORCiD logo [3];  [2];  [1];  [1]
  1. Univ. of Regensburg, Regensburg (Germany)
  2. Radboud Univ., Nijmegen (The Netherlands)
  3. National High Magnetic Field Lab., Los Alamos, NM (United States)
  4. National Institute for Materials Science, Ibaraki (Japan)
Publication Date:
Research Org.:
Los Alamos National Lab. (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. 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, and Chernikov, Alexey. Fri . "Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts". United States. doi: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 = {2018},
month = {8}
}

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