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Ab initio based investigation of thermal transport in superlattices using the Boltzmann equation: Assessing the role of phonon coherence

Ye, Erika and Minnich, Austin J. (2019) Ab initio based investigation of thermal transport in superlattices using the Boltzmann equation: Assessing the role of phonon coherence. Journal of Applied Physics, 125 (5). Art. No. 055107. ISSN 0021-8979. https://resolver.caltech.edu/CaltechAUTHORS:20190205-142100727

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Abstract

The role of the coherent interference of phonons on thermal transport in artificial materials such as superlattices is of intense interest. Recent experimental studies report a non-monotonic trend in thermal conductivity with interface density which is attributed to band-folding of thermal phonons. Various models have been proposed to interpret these measurements, but most make simplifying assumptions that make definitively attributing the trends to the coherent transport difficult. Here, we investigate thermal transport in superlattices in the incoherent limit using the Boltzmann equation with intrinsic phonon dispersions and lifetimes calculated from first-principles. We find that the Boltzmann equation is unable to predict the non-monotonic behavior of thermal conductivity versus superlattice period, supporting the interpretation of phonon interference in recent experiments.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1063/1.5075481DOIArticle
ORCID:
AuthorORCID
Minnich, Austin J.0000-0002-9671-9540
Additional Information:© 2019 Author(s). Published under license by AIP Publishing. Submitted: 22 October 2018 · Accepted: 15 January 2019 · Published Online: 5 February 2019.
Issue or Number:5
Record Number:CaltechAUTHORS:20190205-142100727
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190205-142100727
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92694
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:05 Feb 2019 23:23
Last Modified:07 Feb 2020 20:58

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