It is shown that the three-fold rotational symmetry in transition metal dichalcogenides leads to a Coulomb induced renormalization of the effective electron and hole masses near the K-points of the Brillouin zone. The magnitude of the renormalization depends on the dielectric configuration. The effective exciton mass m=0.4m0 of a freely suspended MoS2 monolayer changes to m=0.35m0 with hBN encapsulation. The mass renormalization increases the excitonic binding energy and reduces the exciton diamagnetic shift and cyclotron frequency. Detailed comparisons with high field measurements of the excitonic diamagnetic shift show excellent agreement.
Cite
@article{arxiv.2006.03037,
title = {Mass Renormalization in Transition Metal Dichalcogenides},
author = {T. Stroucken and J. Neuhaus and S. W. Koch},
journal= {arXiv preprint arXiv:2006.03037},
year = {2020}
}