Magnetoexcitons in Transition-Metal Dichalcogenides Monolayers and Double-Layer Heterostructures

We study direct magnetoexcitons in transition-metal dichalcogenides (TMDC) monolayers and indirect magnetoexcitons in double-layer TMDC heterostructures encapsulated by h-BN. The formations of direct and indirect magnetoexcitons occur in the presence of perpendicular to the layers magnetic field. We calculate the binding energies of 1s, 2s, 3s, and 4s Rydberg states of magnetoexcitons by numerical solution of the Schrödinger equation using both Rytova-Keldysh and Coulomb potentials, and electron and hole masses obtained in the framework of density functional theory. We report the energy contribution from the magnetic field to the binding energies and diamagnetic coefficients for Rydberg states. It is demonstrated that the binding energies of direct and indirect magnetoexcitons can be tuned by applying the external magnetic field. Our calculations show that the choice of the interaction potentials has a significant effect on the binding energies of magnetoexcitons and the diamagnetic coefficients.