Phonon localization in heat conduction
Name
eaat9460.full.pdf
Description
Published version
Size
948.71 KB
Format
Unknown
Checksum (MD5)
9d00a617c23a09cd548cb2595da5a865
Author(s)
Luckyanova, Maria N.
Mendoza, J
Lu, H
Song, Bai
Huang, S
Zhou, J.
Li, M
Dong, Y
Zhou, H
Garlow, J
Date Issued
2018
Journal
Science Advances
Publisher
American Association for the Advancement of Science (AAAS)
Version
Final published version
Abstract
Copyright © 2018 The Authors, some rights reserved; 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 Green’s function simulations. The discovery of phonon localization suggests a new path forward for engineering phonon thermal transport.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution NonCommercial License 4.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1126/SCIADV.AAT9460
