Institute of Industrial Science, The University of Tokyo, Tokyo, 153-8505, Japan.
Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, 305-0044, Japan.
Nat Commun. 2023 Apr 19;14(1):2044. doi: 10.1038/s41467-023-37380-5.
In recent times, the unique collective transport physics of phonon hydrodynamics motivates theoreticians and experimentalists to explore it in micro- and nanoscale and at elevated temperatures. Graphitic materials have been predicted to facilitate hydrodynamic heat transport with their intrinsically strong normal scattering. However, owing to the experimental difficulties and vague theoretical understanding, the observation of phonon Poiseuille flow in graphitic systems remains challenging. In this study, based on a microscale experimental platform and the pertinent occurrence criterion in anisotropic solids, we demonstrate the existence of the phonon Poiseuille flow in a 5.5 μm-wide, suspended and isotopically purified graphite ribbon up to a temperature of 90 K. Our observation is well supported by our theoretical model based on a kinetic theory with fully first-principles inputs. Thus, this study paves the way for deeper insight into phonon hydrodynamics and cutting-edge heat manipulating applications.
近年来，声子流体动力学的独特集体输运物理学激发了理论家和实验家去探索其在微纳尺度和高温下的性质。理论预测石墨材料由于其固有的强正常散射而有利于实现热声子输运。然而，由于实验上的困难和理论理解上的模糊，在石墨体系中观察声子泊肃叶流仍是一个挑战。在这项研究中，我们基于微尺度实验平台和各向异性固体中的相关发生判据，在 90 K 的温度下，在一个 5.5 μm 宽的悬浮、同位素纯化石墨带中，首次证实了声子泊肃叶流的存在。我们的实验观察得到了基于全第一性原理输入的动力学理论的理论模型的有力支持。因此，这项研究为深入了解声子流体动力学和前沿的热管理应用铺平了道路。
