Particle Collisions and Negative Nonlocal Response of Ballistic Electrons
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PhysRevLett.121.176805.pdf
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Author(s)
Shytov, Andrey
Kong, Jian Feng
Falkovich, Gregory
Levitov, Leonid
Date Issued
October 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Shytov, Andrey et al. "Particle Collisions and Negative Nonlocal Response of Ballistic Electrons." Physical Review Letters 121, 17 (October 2018): 176805 © 2018 American Physical Society
Version
Final published version
Abstract
An electric field that builds in the direction against current, known as negative nonlocal resistance, arises naturally in viscous flows and is thus often taken as a telltale of this regime. Here, we predict negative resistance for the ballistic regime, wherein the ee collision mean free path is greater than the length scale at which the system is being probed. Therefore, negative resistance alone does not provide strong evidence for the occurrence of the hydrodynamic regime; it must thus be demoted from the rank of irrefutable evidence to that of a mere forerunner. Furthermore, we find that negative response is log enhanced in the ballistic regime by the physics related to the seminal Dorfman-Cohen log divergence due to memory effects in the kinetics of dilute gases. The ballistic regime therefore offers a unique setting for exploring these interesting effects due to electron interactions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.176805
