Crossover to Quantized Thermal Conductance in Nanotubes and Nanowires

Kohei Yamamoto, Hiroyuki Ishii, Nobuhiko Kobayashi, Kenji Hirose

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Institute of Applied Physics and Tsukuba Research Center for Interdisciplinary Materials Science, University of Tsukuba, Tsukuba, Japan.

DOI: 10.4236/ojcm.2013.32A007                

Abstract

Using the non-equilibrium Green’s function techniques with interatomic potentials, we study 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 for carbon nanotubes, silicon nanowires, and diamond nanowires. We find that this crossover of thermal conductance occurs smoothly for the quasi-one-dimensional materials and its universal behavior is well reproduced by the simplified model characterized by two parameters.

Keywords

Carbon Nanotube; Nanowire; Thermal Transport; Quantum Conductance; Non-Equilibrium Green’s Function

Conflicts of Interest

The authors declare no conflicts of interest.

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