TITLE:
Crossover to Quantized Thermal Conductance in Nanotubes and Nanowires
AUTHORS:
Kohei Yamamoto, Hiroyuki Ishii, Nobuhiko Kobayashi, Kenji Hirose
KEYWORDS:
Carbon Nanotube; Nanowire; Thermal Transport; Quantum Conductance; Non-Equilibrium Green’s Function
JOURNAL NAME:
Open Journal of Composite Materials,
Vol.3 No.2A,
April
30,
2013
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.