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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Analogy and dissimilarity of excitons in monolayer and bilayer of MoSe$_2$
(Submitted on 29 Nov 2022 (v1), last revised 16 Jan 2023 (this version, v2))
Abstract: 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.
Submission history
From: Maciej Molas Dr. [view email][v1] Tue, 29 Nov 2022 13:30:02 GMT (856kb,D)
[v2] Mon, 16 Jan 2023 10:42:17 GMT (875kb,D)
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