# Observation of forbidden phonons and dark excitons by resonance Raman scattering in few-layer WS$_2$

## TL;DR

This study uses resonance Raman scattering to explore exciton-phonon interactions in few-layer WS₂, revealing forbidden phonons, dark excitons, and quantum interference effects, advancing understanding of 2D material optoelectronics.

## Contribution

It demonstrates the detection of forbidden phonons and dark excitons via resonance Raman scattering in 2D WS₂, providing new insights into exciton-phonon coupling and many-body effects.

## Key findings

- Detected forbidden phonons unobservable in ordinary Raman.
- Resolved bright and dark exciton state structures.
- Observed quantum interference between phonons and excitons.

## Abstract

The optical properties of the two-dimensional (2D) crystals are dominated by tightly bound electron-hole pairs (excitons) and lattice vibration modes (phonons). The exciton-phonon interaction is fundamentally important to understand the optical properties of 2D materials and thus help develop emerging 2D crystal based optoelectronic devices. Here, we presented the excitonic resonant Raman scattering (RRS) spectra of few-layer WS$_2$ excited by 11 lasers lines covered all of A, B and C exciton transition energies at different sample temperatures from 4 to 300 K. As a result, we are not only able to probe the forbidden phonon modes unobserved in ordinary Raman scattering, but also can determine the bright and dark state fine structures of 1s A exciton. In particular, we also observed the quantum interference between low-energy discrete phonon and exciton continuum under resonant excitation. Our works pave a way to understand the exciton-phonon coupling and many-body effects in 2D materials.