Okeke Chisom, Juma Isaac, Cobarrubia Antonio, Schottle Nicholas, Maddah Hisham, Mortazavi Mansour, Behura Sanjay K
Department of Mathematics and Computer Science and Department of Chemistry and Physics, University of Arkansas at Pine Bluff, 1200 N. University Drive, Pine Bluff, AR 71601, United States.
Department of Physics, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, United States.
iScience. 2023 Jun 18;26(7):107174. doi: 10.1016/j.isci.2023.107174. eCollection 2023 Jul 21.
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.
了解量子材料的光热物理特性将有助于高效设计下一代光子和超导电路。非谐声子动力学是强相互作用光热物理的核心。这是因为非谐声子气体的压力与温度有关。声子-声子和电子-声子量子相互作用会导致非谐声子效应。在这里，我们通过温度相关拉曼光谱和机器学习策略研究了物理剥离的WS范德华晶体的光热特性。这项基础研究将揭示温度对WS面内和面外拉曼位移（拉曼测温）的依赖性，以研究热导率、热载流子扩散系数和热膨胀系数。
