Nano-cross-junction effect on phonon transport in silicon nanowire cages

Dengke Ma (马登科), Hongru Ding (丁鸿儒), Han Meng (孟涵), Lei Feng, Yue Wu, Junichiro Shiomi, and Nuo Yang (杨诺)
Phys. Rev. B 94, 165434 – Published 24 October 2016

Abstract

Wave effects of phonons can give rise to controllability of heat conduction in nanostructures beyond that by particle scattering at surfaces and interfaces. In this paper, we propose a new class of three-dimensional nanostructures: a silicon-nanowire-cage (SiNWC) structure consisting of silicon nanowires (SiNWs) connected by nano-cross-junctions. We perform equilibrium molecular dynamics simulations and find an ultralow value of thermal conductivity of SiNWC, 0.173Wm1K1, which is one order lower than that of SiNWs. By further modal analysis and atomistic Green's function calculations, we identify that the large reduction is due to significant phonon localization induced by the phonon local resonance and hybridization at the junction part in a wide range of phonon modes. This localization effect does not require the cage to be periodic, unlike the phononic crystals, and can be realized in structures that are easier to synthesize, for instance in a form of randomly oriented SiNW network.

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  • Received 23 November 2015
  • Revised 2 August 2016

DOI:https://doi.org/10.1103/PhysRevB.94.165434

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Dengke Ma (马登科)1,2, Hongru Ding (丁鸿儒)1,2, Han Meng (孟涵)1,2, Lei Feng3, Yue Wu4,5, Junichiro Shiomi3,6,*, and Nuo Yang (杨诺)1,2,†

  • 1State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology (HUST), Wuhan 430074, People's Republic of China
  • 2Nano Interface Center for Energy (NICE), School of Energy and Power Engineering, HUST, Wuhan 430074, People's Republic of China
  • 3Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
  • 4School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 200235, People's Republic of China
  • 5Department of Chemical and Biological Engineering, Iowa State University, 2033 Sweeney Hall, Ames, Iowa 50011, USA
  • 6Center for Materials Research by Information Integration, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

  • *shiomi@photon.t.u-tokyo.ac.jp
  • nuo@hust.edu.cn

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Vol. 94, Iss. 16 — 15 October 2016

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