Reflectance and magneto-reflectance experiments together with theoretical modelling based on the k⋅p approach have been employed to study the evolution of direct bandgap excitons in MoS2 layers with a thickness ranging from mono- to trilayer. The extra excitonic resonances observed in MoS2 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 MoS2.
@article{arxiv.1810.00623,
title = {Fine structure of $\mathrm{K}$-excitons in multilayers of transition metal dichalcogenides},
author = {A. O. Slobodeniuk and Ł. Bala and M. Koperski and M. R. Molas and P. Kossacki and K. Nogajewski and M. Bartos and K. Watanabe and T. Taniguchi and C. Faugeras and M. Potemski},
journal= {arXiv preprint arXiv:1810.00623},
year = {2019}
}