Cammarata Antonio
Department of Control Engineering, Czech Technical University in Prague Technicka 2 16627 Prague 6 Czech Republic
RSC Adv. 2019 Nov 18;9(64):37491-37496. doi: 10.1039/c9ra08294h. eCollection 2019 Nov 13.
Phonon-phonon scattering processes are the crucial phenomena which account for phonon decay, thermal expansion, heat transfer, protein dynamics, spin relaxation and related quantities. In this work, we show how the symmetries of the system determine which scattering processes are allowed at any order of anharmonic approximation, irrespective of the chemical composition. We also discuss how to control the system symmetries to switch on and off any single scattering process. We apply the presented results to the study and control of nanoscale intrinsic friction and thermal transport in lamellar van der Waals transition metal dichalcogenides. Thanks to its general formulation, the presented framework expands the materials science tool set for the design of nanoengineered thermally-active materials, irrespective of the specific chemical composition and atomic topology.
声子-声子散射过程是导致声子衰变、热膨胀、热传递、蛋白质动力学、自旋弛豫及相关量的关键现象。在这项工作中，我们展示了系统的对称性如何决定在任何非谐近似阶次下哪些散射过程是允许的，而与化学成分无关。我们还讨论了如何控制系统对称性来开启和关闭任何单个散射过程。我们将所呈现的结果应用于层状范德华过渡金属二硫属化物中纳米级固有摩擦和热输运的研究与控制。由于其通用的表述形式，所提出的框架扩展了用于设计纳米工程热活性材料的材料科学工具集，而与具体的化学成分和原子拓扑结构无关。
