Theory of thermal transport in nanowires

2014 Fiscal Year Final Research Report

• Project/Area Number: 24656029
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Thin film/Surface and interfacial physical properties
• Research Institution: University of Tsukuba
• Principal Investigator: KOBAYASHI Nobuhiko 筑波大学, 数理物質系, 准教授 (10311341)
• Co-Investigator(Kenkyū-buntansha): KOBAYASHI Kazuaki 物質材料研究機構, 理論計算科学ユニット, 主幹研究員 (00354150)
• Co-Investigator(Renkei-kenkyūsha): ISHII Hiroyuki 筑波大学, 数理物質系, 助教 (00585127)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 熱伝導 / ナノワイヤ / 理論

Outline of Final Research Achievements

We have developed a method of calculating thermal transport properties using non-equilibrium Green’s function techniques from atomistic levels. We applied the method to analysis of transport properties of nanowires and nanotubes. We have elucidated the temperature dependence and the crossover of thermal conductance from the usual behavior proportional to the cross-sectional area at room temperature to the universal quantized behavior at low temperature. We also find that this crossover of thermal conductance occurs smoothly for the quasi-one-dimensional materials. We also analyzed the phonon lifetime due to phonon-phonon scatterings by the anharmonic terms of interatomic forces.

Free Research Field

計算物理