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Distinguishing between spatial coherence and temporal coherence of phonons

Latour, Benoit and Chalopin, Yann (2017) Distinguishing between spatial coherence and temporal coherence of phonons. Physical Review B, 95 (21). Art. No. 214310. ISSN 2469-9950. doi:10.1103/PhysRevB.95.214310.

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Coherent phonon transport is regarded as a promising strategy for controlling thermal properties in solids using the wave nature of phonons. However, no clear distinction between the spatial and temporal phonon coherence has been accounted for and a formalism that quantifies these two effects is still to be found. In this work, we propose a statistical approach for calculating the spatial and temporal coherence spectra using molecular dynamics simulations. We provide a microscopic assessment of these properties and we theoretically demonstrate that, while temporal and spatial coherence can be analytically related under specific conditions, they represent two characteristic lengths that set apart different physical effects. The former is associated with the phonon mean free path while the latter can be regarded as a measure of localization, representing the spatial extension of phonon wave packets. This provides a framework to engineer heat conduction in solids by quantitatively revealing the wave/particle nature of the vibrational modes.

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Additional Information:© 2017 American Physical Society. Received 12 December 2016; published 30 June 2017. We acknowledge the support of the ENIAC program under the NANOTEG Project Grant No. 270789-2 and of the French Ministry of Defense (Direction Générale de l’Armement).
Funding AgencyGrant Number
ENIAC Joint Undertaking270789-2
Direction Générale de l’ArmementUNSPECIFIED
Issue or Number:21
Record Number:CaltechAUTHORS:20170630-111559684
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Official Citation:Distinguishing between spatial coherence and temporal coherence of phonons Benoit Latour and Yann Chalopin Phys. Rev. B 95, 214310 (2017) – Published 30 June 2017
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78729
Deposited By: Ruth Sustaita
Deposited On:30 Jun 2017 20:06
Last Modified:15 Nov 2021 17:42

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