Current browse context:
cond-mat.mes-hall
Change to browse by:
References & Citations
Condensed Matter > Mesoscale and Nanoscale Physics
Title: Superscreening by a Retroreflected Hole Backflow in Tomographic Electron Fluids
(Submitted on 7 Dec 2020 (v1), last revised 17 Dec 2020 (this version, v2))
Abstract: Electron hydrodynamics gives rise to surprising correlated behaviors in which electrons "cooperate" to quench dissipation and reduce the electric fields needed to sustain the flow. Such collective "free" flows are usually expected at the hydrodynamic lengthscales exceeding the electron-electron scattering mean free path $\ell_{\rm ee}$. Here we predict that in two-dimensional electron gases the collective free flows actually occur at the distances much smaller than $\ell_{\rm ee}$, in a nominally ballistic regime. The sub-$\ell_{\rm ee}$ free flows arise due to retroreflected holes originating from head-on electron electron collisions, which retrace the paths of impinging electrons and cancel out their potential. An exact solution, obtained in Corbino geometry, predicts potential strongly screened by the hole backflow. Screened potential is described by a fractional power law $r^{-5/3}$ over a wide range of $r$ values, from macroscales down to deep sub-$\ell_{\rm ee}$ scales, and a distinct non-Fermi-liquid temperature dependence.
Submission history
From: Leonid Levitov [view email][v1] Mon, 7 Dec 2020 16:39:55 GMT (99kb,D)
[v2] Thu, 17 Dec 2020 18:46:26 GMT (109kb,D)
Link back to: arXiv, form interface, contact.