Monolayer transition metal dichalcogenides in strong magnetic fields: Validating the Wannier model using a microscopic calculation

TL;DR

This paper uses a microscopic equation of motion approach to calculate excitonic properties of monolayer TMDs in magnetic fields, validating the Wannier model against experimental data and analyzing environmental effects.

Contribution

It provides a detailed microscopic calculation of magnetoexcitons in monolayer TMDs, validating and comparing with the Wannier model and experiments.

Findings

Good agreement between EOM calculations and experimental exciton energies

EOM-derived exciton energies are slightly lower than Wannier model predictions

Dielectric environment has minimal impact on magnetoexciton transition energy

Abstract

Using an equation of motion (EOM) approach, we calculate excitonic properties of monolayer transition metal dichalcogenides (TMDs) perturbed by an external magnetic field. We compare our findings to the widely used Wannier model for excitons in two-dimensional materials and to recent experimental results. We find good agreement between the calculated excitonic transition energies and the experimental results. In addition, we find that the exciton energies calculated using the EOM approach are slightly lower than the ones calculated using the Wannier model. Finally, we also show that the effect of the dielectric environment on the magnetoexciton transition energy is minimal due to counteracting changes in the exciton energy and the exchange self-energy correction.