Journal
SCIENCE ADVANCES
Volume 4, Issue 12, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aat9460
Keywords
-
Categories
Funding
- Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001299]
- Center for Energy Efficient Materials (CEEM), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001009]
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- U.S. Department of Energy, Office of Basic Energy Science, Division of Materials Science and Engineering [DE-SC0012704]
- NIST, U.S. Department of Commerce
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available