Spatial extent of the excited exciton states in monolayers from diamagnetic shifts
- 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)
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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1471368
- Report Number(s):
- LA-UR-18-27842; PRBMDO
- Journal Information:
- Physical Review B, Vol. 98, Issue 7; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Revealing exciton masses and dielectric properties of monolayer semiconductors with high magnetic fields
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journal | September 2019 |
Reversible crystalline-to-amorphous phase transformation in monolayer MoS 2 under grazing ion irradiation
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journal | January 2020 |
Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response
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journal | July 2019 |
Monolayer transition metal dichalcogenides in strong magnetic fields: Validating the Wannier model using a microscopic calculation
|
journal | January 2019 |
Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response | text | January 2019 |
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