Zipfel, Jonas and Holler, Johannes and Mitioglu, Anatolie A. and Ballottin, Mariana and Nagler, Philipp and Stier, Andreas and Taniguchi, Takashi and Watanabe, Kenji and Crooker, Scott A. and Christianen, Peter C. M. and Korn, Tobias and Chernikov, Alexey (2018) Spatial extent of the excited exciton states in WS2 monolayers from diamagnetic shifts. PHYSICAL REVIEW B, 98 (7): 075438. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SEMICONDUCTOR; WSE2; SPECTRA; ENERGY; MOS2; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Jan 2020 08:16 |
| Last Modified: | 10 Jan 2020 08:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14017 |
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