# Magneto-spectroscopy of exciton Rydberg states in a CVD grown WSe2 monolayer

## TL;DR

This study uses magneto-spectroscopy to investigate exciton Rydberg states in CVD-grown WSe2 monolayers, revealing detailed excitonic properties and demonstrating the material's suitability for optoelectronic applications.

## Contribution

It provides the first detailed magneto-optical analysis of excitons in CVD-grown WSe2 monolayers, including g-factors and wave function extents.

## Key findings

- Observation of narrow 1s exciton emission linewidth (4.7 meV)
- Detection of 2s excitonic state at higher energy
- Establishment of CVD WSe2 monolayers as viable for optoelectronics

## Abstract

The results of magneto-optical spectroscopy investigations of excitons in a CVD grown monolayer of WSe2 encapsulated in hexagonal boron nitride are presented. The emission linewidth for the 1s state is of 4:7 meV, close to the narrowest emissions observed in monolayers exfoliated from bulk material. The 2s excitonic state is also observed at higher energies in the photoluminescence spectrum. Magneto-optical spectroscopy allows for the determination of the g-factors and of the spatial extent of the excitonic wave functions associated with these emissions. Our work establishes CVD grown monolayers of transition metal dichalcogenides as a mature technology for optoelectronic applications.