Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V22: Electrons, Phonons, Electron-Phonon Scattering and Phononics VII
2:30 PM–5:30 PM,
Thursday, March 7, 2019
BCEC
Room: 157C
Sponsoring
Units:
DCOMP DMP
Chair: Athanasios Chantis, Physical Review Materials, American Physical Society
Abstract: V22.00009 : Local thermal current from cold to hot in a classical harmonic system with multi-path geometry
4:06 PM–4:18 PM
Presenter:
Palak Dugar
(University of California, Merced)
Authors:
Palak Dugar
(University of California, Merced)
Chih-Chun Chien
(University of California, Merced)
We show an atypical, local steady-state thermal current from cold to hot emerge in a classical harmonic system of Hookean springs and masses driven by two Langevin Reservoirs at different temperatures. The simulations were performed by the standard molecular dynamics, and physical quantities such as the thermal current were averaged over random realizations in the steady-state regime. Our results show that the atypical thermal current depends explicitly on the system-reservoir coupling, in addition to the spring constants and masses. Including non-linear on-site potentials which models the system-substrate coupling further tunes the regime where the atypical local thermal current can survive. Our theoretical framework is universal and applies to classical systems following Newtonian dynamics. If we consider possible realizations using nano-mechanical systems, the device with a tunable local thermal current may function as a thermal switch or memory element.
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