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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Monitoring Heat Conduction in Nanostructures with Embedded Planar Defects

Get access (open in a dialog) DOI: 10.1615/IHTC15.nmm.009642
pages 5467-5472

Sinopsis

Recent progresses in the field of thermoelectric materials have clearly uncovered the substantial gain obtained from the decrease of thermal conductivity. Finding new routes to introduce additional thermal resistances in solid and crystalline materials is hence of primary importance. We propose to exploit a new physical mechanism based on phonon Fano effect to control the phonon distribution carrying the heat in crystals. The key idea is to introduce planar and periodic defects that force phonons into both a non-defective and a defective paths. The resulting wave interference generates a band gap in the thermal phonon spectrum that can be controlled by the mass of the defect atoms. We use both analytical and Molecular Dynamics technique to investigate this phenomenon and design the optimal configuration. A Wave-packet Dynamics technique is implemented to provide a per-mode transmission and highlight the spectrum structure versus the defect masses. The results are then confronted to a lattice dynamic approach for confirmation.