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Title: Phonon coherence in isotopic silicon superlattices

Recent experimental and theoretical investigations have confirmed that a reduction in thermal conductivity of silicon is achieved by isotopic silicon superlattices. In the present study, non-equilibrium molecular dynamics simulations are performed to identify the isotope doping and isotope layer ordering with minimum thermal conductivity. Furthermore, the impact of isotopic intermixing at the superlattice interfaces on phonon transport is investigated. Our results reveal that the coherence of phonons in isotopic Si superlattices is prevented if interfacial mixing of isotopes is considered.
Authors:
; ; ;  [1] ;  [2]
  1. Institute of Materials Physics, Westfälische Wilhelms-Universität Münster, 48149 Münster (Germany)
  2. Faculty of Physics, University Duisburg-Essen, 47048 Duisburg (Germany)
Publication Date:
OSTI Identifier:
22350798
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; EQUILIBRIUM; INTERFACES; LAYERS; MIXING; MOLECULAR DYNAMICS METHOD; PHONONS; REDUCTION; SILICON; SIMULATION; SUPERLATTICES; THERMAL CONDUCTIVITY