Probing anharmonic phonons in WS 2 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 temp...

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Bibliographic Details
Published in:iScience 2023-07, Vol.26 (7), p.107174
Main Authors: Okeke, Chisom, Juma, Isaac, Cobarrubia, Antonio, Schottle, Nicholas, Maddah, Hisham, Mortazavi, Mansour, Behura, Sanjay K
Format: Article
Language:English
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Summary: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 WS 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 WS to study the thermal conductivity, hot carrier diffusion coefficient, and thermal expansion coefficient.
ISSN:2589-0042
DOI:10.1016/j.isci.2023.107174