Observation of Rydberg excitons in monolayer MoS2 at room temperature by Imbert-Fedorov shift spectroscopy

TL;DR

This paper reports the first room-temperature observation of Rydberg excitons in monolayer MoS2 using Imbert-Fedorov shift spectroscopy, demonstrating a new method for studying excitonic properties in 2D materials.

Contribution

It introduces Imbert-Fedorov shift spectroscopy as a novel technique to detect Rydberg excitons in monolayer MoS2 at room temperature, overcoming previous limitations.

Findings

Multiple Rydberg exciton states observed at room temperature

Quasiparticle band gaps for A and B excitons extracted

Temperature-induced redshift of the band gap confirmed

Abstract

Rydberg excitons in transition metal dichalcogenides (TMDs) have emerged as a promising platform for investigating the properties of open quantum systems, thanks to their large binding energies(hundreds of meV). However, the study of Rydberg excitons in TMDs has been hindered by sample quality limitations, strong background signals from ground excitons, and broadening at room temperature. In this work, we report the first observation of multiple Rydberg exciton states in monolayer MoS2 at room temperature using Imbert-Fedorov (IF) shift spectroscopy. By numerically solving the Schrodinger equation, we extracted the quasiparticle band gaps for A and B excitons, confirming the temperature-induced redshift of the band gap, in excellent agreement with previous results. Our findings establish IF shift spectroscopy as a powerful tool for characterizing Rydberg excitons in TMDs, paving the way for potential applications in quantum manipulation and control.