Managing Phonon Transport by Core/Shell Nanowires

Abstract

We studied thermal conductivity in core-shell nanowires (NW) by using molecular dynamics simulations. Interestingly, a remarkable oscillation effect in heat current autocorrelation function in core-shell NWs has been observed, while the same effect is absent in pure silicon nanowires, nanotube structures, and random doped nanowires. Detailed characterizations of the oscillation signal reveal that this intriguing oscillation is caused by the coherent resonance effect of the transverse and longitudinal phonon modes. This phonon resonance results in the localization of the longitudinal modes, which leads to the reduction of thermal conductivity in core-shell nanowires. Our study provides a novel coherent mechanism that can be used to tune thermal conductivity in core-shell nanowires.

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Document Details

Document Type
Technical Report
Publication Date
Nov 28, 2012
Accession Number
ADA570448

Entities

People

  • Li Baowen

Organizations

  • National University of Singapore

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Autocorrelation
  • Band Structures
  • Conduction (Heat Transfer)
  • Conductivity
  • Dynamics
  • Equations Of Motion
  • Fullerenes
  • Materials
  • Molecular Dynamics
  • Oscillation
  • Physics
  • Resonance
  • Simulations
  • Thermal Conductivity
  • Transport Properties
  • Transport Ships
  • Transverse

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Materials Science and Engineering.
  • Nanoscale Plasmonic Nanotechnology