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We have developed a microspectroscopy technique for measuring gate-modulated reflectance to probe excitonic states in two-dimensional transition metal dichalcogenides. Through the use of gate-modulated spectroscopy, we were able to detect excited states of excitons and trions, which would typically have weak optical signals in traditional reflectance spectroscopy. Using a transfer matrix method for spectral analysis, the binding energy of trion 2s was determined to be 26 meV. As observing the Rydberg series of excitonic states provides fruitful information on the strong Coulomb interaction in two-dimensional systems, gate-modulated spectroscopy can be a versatile tool for understanding underlying many-body physics as well as designing next-generation quantum optoelectronics based on two-dimensional materials.

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• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters 123, 063101 (2023) and may be found at https://doi.org/10.1063/5.0159245.

Keyword: excitons, 2D materials, modulation spectroscopy

Date published: 2023-08-07

Publisher: AIP Publishing

Journal:

• APPLIED PHYSICS LETTERS (ISSN: 00036951) vol. 123 issue. 6 p. 63101-63101

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4328

First published URL: https://doi.org/10.1063/5.0159245

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Updated at: 2024-01-12 13:22:21 +0900

Published on MDR: 2024-01-12 16:30:09 +0900