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 ord...

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Bibliographic Details
Published in:Applied physics letters 2014-09, Vol.105 (13)
Main Authors: Frieling, R., Radek, M., Eon, S., Bracht, H., Wolf, D. E.
Format: Article
Language:English
Subjects:
Applied physics
Coherence
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
EQUILIBRIUM
Heat conductivity
Heat transfer
INTERFACES
LAYERS
MIXING
Molecular dynamics
MOLECULAR DYNAMICS METHOD
PHONONS
REDUCTION
SILICON
SIMULATION
SUPERLATTICES
THERMAL CONDUCTIVITY
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4897002