# Magneto-photoluminescence of exciton Rydberg states in monolayer WSe$_2$

## TL;DR

This study investigates the magneto-photoluminescence of exciton Rydberg states in monolayer WSe₂, revealing their Zeeman and diamagnetic behaviors, and deducing key exciton properties under high magnetic fields.

## Contribution

First measurement of photoluminescence from multiple exciton Rydberg states in monolayer WSe₂ under strong magnetic fields, providing new insights into their optical and magnetic properties.

## Key findings

- Zeeman shifts are similar across Rydberg states.
- Distinct diamagnetic shifts allow determination of exciton radii.
- Results align with theoretical models and prior experiments.

## Abstract

Monolayer WSe$_2$ hosts a series of exciton Rydberg states denoted by the principal quantum number n = 1, 2, 3, etc. While most research focuses on their absorption properties, their optical emission is also important but much less studied. Here we measure the photoluminescence from the 1s - 5s exciton Rydberg states in ultraclean monolayer WSe$_2$ encapsulated by boron nitride under magnetic fields from -31 T to 31 T. The exciton Rydberg states exhibit similar Zeeman shifts but distinct diamagnetic shifts from each other. From their luminescence spectra, Zeeman and diamagnetic shifts, we deduce the binding energies, g-factors and radii of the 1s - 4s exciton states. Our results are consistent with theoretical predictions and results from prior magneto-reflection experiments.

---
Source: https://tomesphere.com/paper/1901.11044