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Title: Ballistic thermal transport in a cylindrical semiconductor nanowire modulated with bridge contacts

Using the scattering-matrix method, we studied ballistic phonon transmission and thermal conductance at low temperatures in a cylindrical quantum wire with bridge contacts. The transmission coefficient exhibited a stepped profile, which became more evident as the bridge radius increased. When the dimensions of the bridge are identical to those of main wires, we observed a quantum platform of the thermal conductance, even in the presence of interface scattering. When the dimensions of the bridge are smaller than those of main wires, however, we could not observe the quantum platform. We also revealed other interesting physical properties, such as universal quantum thermal conductance and resonant transmission. A brief analysis of these results is given.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Mathematics and Physics, Hunan Institute of Technology, Hengyang 421002 (China)
  2. Department of Physics and Electronics Information, Hunan Institute of Science and Technology, Yueyang 414004 (China)
Publication Date:
OSTI Identifier:
22305800
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 116; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; CYLINDRICAL CONFIGURATION; HEAT TRANSFER; INTERFACES; NANOWIRES; PHYSICAL PROPERTIES; QUANTUM WIRES; SCATTERING; SEMICONDUCTOR MATERIALS; THERMAL CONDUCTIVITY; TRANSMISSION