Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session R62: Thermal Transport in Nanostructures I
8:00 AM–10:48 AM,
Thursday, March 5, 2020
Room: Mile High Ballroom 4C
Sponsoring
Unit:
DMP
Chair: Charles Harris, Sandia National Laboratories
Abstract: R62.00010 : Nonequilibrium phonon distribution in current-driven nanostructures*
Presenter:
Guanxiong Chen
(Department of Physics, Emory University)
Authors:
Guanxiong Chen
(Department of Physics, Emory University)
Ryan M Freeman
(Department of Physics, Emory University)
Andrei Zholud
(Department of Physics, Emory University)
Sergei Urazhdin
(Department of Physics, Emory University)
We demonstrate a strongly non-equilibrium phonon distribution in current-driven metallic microwires, which cannot be described in terms of heat [1]. Our main observation is a linear dependence of resistance on current at cryogenic temperatures, qualitatively inconsistent with the effects of Joule heating, as confirmed by the simulations of heat flow. As the temperature is increased, the zero-current singularity becomes smoothed out, but the linear dependence remains apparent at sufficiently large currents even near ambient temperatures. A kinetic model based on the quasi-ballistic escape approximation for the nonequilibrium phonons generated by electron scattering reproduces our main observations. The demonstrated effects are important for optimizing thermal management in electronic and thermoelectric nanodevices, and for the analysis of current-induced thermal effects at nanoscale.
[1] G.X. Chen, R. Freeman, A. Zholud, S. Urazhdin, arXiv:1907.00224.
*Supported by the grant # DE-SC2218976 funded by the U.S. DOE Office of Science
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