Phonon localization in heat conduction

M. N. Luckyanova, J. Mendoza, H. Lu, B. Song, S. Huang, J. Zhou, M. Li, Y. Dong, H. Zhou, J. Garlow, L. Wu, B. J. Kirby, A. J. Grutter, A. A. Puretzky, Y. Zhu, M. S. Dresselhaus, A. Gossard, G. Chen

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article numbereaat9460
JournalScience Advances
Volume4
Issue number12
DOIs
StatePublished - Dec 21 2018

All Science Journal Classification (ASJC) codes

  • General

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