Phonon localization in heat conduction

Nondiffusive phonon thermal transport, extensively observed in nanostructures, has largely been attributed to classical size effects, ignoring the wave nature of phonons. We report localization behavior in phonon heat conduction due to multiple scattering and interference events of broadband phonons...

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Bibliographic Details
Published in:	Science advances Vol. 4; no. 12; p. eaat9460
Main Authors:	Luckyanova, M N, Mendoza, J, Lu, H, Song, B, Huang, S, Zhou, J, Li, M, Dong, Y, Zhou, H, Garlow, J, Wu, L, Kirby, B J, Grutter, A J, Puretzky, A A, Zhu, Y, Dresselhaus, M S, Gossard, A, Chen, G
Format:	Journal Article
Language:	English
Published:	United States AAAS 21-12-2018 American Association for the Advancement of Science
Subjects:	ENGINEERING MATERIALS SCIENCE Physics SciAdv r-articles
Online Access:	Get full text
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Summary:	Nondiffusive phonon thermal transport, extensively observed in nanostructures, has largely been attributed to classical size effects, ignoring the wave nature of phonons. We report localization behavior in phonon heat conduction due to multiple scattering and interference events of broadband phonons, by measuring the thermal conductivities of GaAs/AlAs superlattices with ErAs nanodots randomly distributed at the interfaces. With an increasing number of superlattice periods, the measured thermal conductivities near room temperature increased and eventually saturated, indicating a transition from ballistic to diffusive transport. In contrast, at cryogenic temperatures the thermal conductivities first increased but then decreased, signaling phonon wave localization, as supported by atomistic Greenșs function simulations. The discovery of phonon localization suggests a new path forward for engineering phonon thermal transport.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) SC0012704; SC0001299; SC0001009; AC02-06CH11357 BNL-210909-2019-JAAM Present address: Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794, USA. Present address: College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China. Present address: Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. Present address: Department of Electrical Engineering, Pennsylvania State University, University Park, PA 16802, USA.
ISSN:	2375-2548 2375-2548
DOI:	10.1126/sciadv.aat9460