Analogy and dissimilarity of excitons in monolayer and bilayer of MoSe2
| Autor: | Lucja Kipczak, Artur O. Slobodeniuk, Tomasz Woźniak, Mukul Bhatnagar, Natalia Zawadzka, Katarzyna Olkowska Pucko, Magdalena Joanna Grzeszczyk, Kenji Watanabe, Takashi Taniguchi, A Babinski, Maciej Molas |
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| Rok vydání: | 2023 |
| Předmět: |
Condensed Matter - Materials Science
Condensed Matter - Mesoscale and Nanoscale Physics Mechanics of Materials Mechanical Engineering Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Materials Science General Chemistry Condensed Matter Physics |
| Zdroj: | 2D Materials. |
| ISSN: | 2053-1583 |
| Popis: | Excitons in thin layers of semiconducting transition metal dichalcogenides are highly subject to the strongly modified Coulomb electron-hole interaction in these materials. Therefore, they do not follow the model system of a two-dimensional hydrogen atom. We investigate experimentally and theoretically excitonic properties in both the monolayer (ML) and the bilayer (BL) of MoSe$_2$ encapsulated in hexagonal BN. The measured magnetic field evolutions of the reflectance contrast spectra of the MoSe$_2$ ML and BL allow us to determine $g$-factors of intralayer A and B excitons, as well as the $g$-factor of the interlayer exciton. We explain the dependence of $g$-factors on the number of layers and excitation state using first principles calculations. Furthermore, we demonstrate that the experimentally measured ladder of excitonic $s$ states in the ML can be reproduced using the $\mathbf{k\cdot p}$ approach with the Rytova-Keldysh potential that describes the electron-hole interaction. In contrast, the analogous calculation for the BL case requires taking into account the out-of-plane dielectric response of the MoSe$_2$ BL. 10 pages, 4 figures, + SM |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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