Probing anharmonic phonons in WS2 van der Waals crystal by Raman spectroscopy and machine learning

Understanding the optothermal physics of quantum materials will enable the efficient design of next-generation photonic and superconducting circuits. Anharmonic phonon dynamics is central to strongly interacting optothermal physics. This is because the pressure of a gas of anharmonic phonons is temperature dependent. Phonon-phonon and electron-phonon quantum interactions contribute to the anharmonic phonon effect. Here we have studied the optothermal properties of physically exfoliated WS2 van der Waals crystal via temperature-dependent Raman spectroscopy and machine learning strategies. This fundamental investigation will lead to unveiling the dependence of temperature on in-plane and out-of-plane Raman shifts (Raman thermometry) of WS2 to study the thermal conductivity, hot carrier diffusion coefficient, and thermal expansion coefficient.

Automated summary

The optothermal properties of physically exfoliated WS2 van der Waals crystal were studied using temperature-dependent Raman spectroscopy and machine learning strategies. This fundamental investigation will unveil the temperature dependence of WS2 and allows for the study of thermal conductivity, hot carrier diffusion coefficient, and thermal expansion coefficient.