Fine structure of $\mathrm{K}$-excitons in multilayers of transition metal dichalcogenides

Abstract

Reflectance and magneto-reflectance experiments together with theoretical modelling based on the $\mathbf{k}\cdot \mathbf{p}$ approach have been employed to study the evolution of direct bandgap excitons in MoS${}_2$ layers with a thickness ranging from mono- to trilayer. The extra excitonic resonances observed in MoS${}_2$ multilayers emerge as a result of the hybridization of Bloch states of each sub-layer due to the interlayer coupling. The properties of such excitons in bi- and trilayers are classified by the symmetry of corresponding crystals. The inter- and intralayer character of the reported excitonic resonances is fingerprinted with the magneto-optical measurements: the excitonic $g$-factors of opposite sign and of different amplitude are revealed for these two types of resonances. The parameters describing the strength of the spin-orbit interaction are estimated for bi- and trilayer MoS${}_2$.

arXiv comment14 pages, 10 figures

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