arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.01967cond-mat.mtrl-sciphysics.app-ph
收藏

晶体和无序固体热输运的高效非谐晶格动力学计算

Efficient Anharmonic Lattice Dynamics Calculations of Thermal Transport in Crystalline and Disordered Solids

Giuseppe Barbalinardo, Zekun Chen, Nicholas W. Lundgren, Davide Donadio

摘要:

了解半导体和绝缘体中的热传输具有根本的重要性,因为它对电子和可再生能源的收集和转换具有技术影响。非谐晶格动力学为描述纳米尺度下的热输运提供了一个强有力的框架。这种方法的优点之一是,它自然包括由于原子振动而产生的量子效应,这是计算纳米技术中广泛使用的半导体(如硅和碳)即使在室温下的热性能所必需的。虽然从微观角度来看,非晶和晶体半导体之间的热传输图像有很大的不同,但已经设计了一种统一的方法来模拟晶体和玻璃。在这里,我们介绍了一个统一的工作流程,它实现了玻尔兹曼输运方程(BTE)和准谐波Green-Kubo(QHGK)方法。我们讨论了如何优化理论,利用现代并行架构,以及它是如何实现的$κALDo$:一个多功能和可扩展的开源软件来计算声子输运固体。这种方法适用于晶体和部分无序的硅基系统,包括体硅和笼形物,并在硅锗合金笼形物大大降低了热导率。

英文摘要:

Understanding heat transport in semiconductors and insulators is of fundamental importance because of its technological impact in electronics and renewable energy harvesting and conversion. Anharmonic Lattice Dynamics provides a powerful framework for the description of heat transport at the nanoscale. One of the advantages of this method is that it naturally includes quantum effects due to atoms vibrations, which are needed to compute the thermal properties of semiconductors widely used in nanotechnology, like silicon and carbon, even at room temperature. While the heat transport picture substantially differs between amorphous and crystalline semiconductors from a microscopic standpoint, a unified approach to simulate both crystals and glasses has been devised. Here we introduce a unified workflow, which implements both the Boltzmann Transport equation (BTE) and the Quasi Harmonic Green-Kubo (QHGK) methods. We discuss how the theory can be optimized to exploit modern parallel architectures, and how it is implemented in $κALDo$: a versatile and scalable open-source software to compute phonon transport in solids. This approach is applied to crystalline and partially disordered silicon-based systems, including bulk silicon and clathrates, and on silicon-germanium alloy clathrates with largely reduced thermal conductivity.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑