# Excitonic magneto-optics in monolayer transition metal dichalcogenides: From nanoribbons to two-dimensional response

## TL;DR

This paper investigates the magneto-optical properties of monolayer TMDs, emphasizing excitonic effects, and demonstrates significant enhancements in Hall conductivity and accurate diamagnetic shift predictions aligned with experiments.

## Contribution

It introduces a nanoribbon-based approach to study excitonic magneto-optics in monolayer TMDs, highlighting the impact of excitonic effects on optical Hall conductivity and diamagnetic shifts.

## Key findings

- Excitonic effects increase optical Hall conductivity amplitude by an order of magnitude.
- Calculated Faraday rotation spectra match experimental data for MoS2 and WSe2.
- Diamagnetic shifts of excitons agree well with recent measurements.

## Abstract

The magneto-optical response of monolayer transition metal dichalcogenides (TMDs), including excitonic effects, is studied using a nanoribbon geometry. We compute the diagonal optical conductivity and the Hall conductivity. Comparing the excitonic optical Hall conductivity to results obtained in the independent particle approximation, we find an increase in the amplitude corresponding to one order of magnitude when excitonic effects are included. The Hall conductivities are used to calculate Faraday rotation spectra for MoS2 and WSe2. Finally, we have also calculated the diamagnetic shift of the exciton states of WSe2 in different dielectric environments. Comparing the calculated diamagnetic shift to recent experimental measurements, we find a very good agreement between the two.