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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Evidence for local spots of viscous electron flow in graphene at moderate mobility
(Submitted on 21 Mar 2021 (v1), revised 17 Dec 2021 (this version, v3), latest version 16 Jan 2022 (v4))
Abstract: Dominating electron-electron scattering enables viscous electron flow exhibiting hydrodynamic current density patterns such as Poiseuille profiles or vortices. The viscous regime has recently been observed in graphene by non-local transport experiments and mapping of the Poiseuille profile. Here, we probe the current-induced surface potential maps of graphene field effect transistors with moderate mobility using scanning probe microscopy at room temperature. We discover micron-sized large areas appearing close to charge neutrality that show current induced electric fields opposing the externally applied field. By estimating the local scattering lengths from the gate dependence of local in-plane electric fields, we find that electron-electron scattering dominates in these areas as expected for viscous flow. Moreover, we suppress the inverted fields by artificially decreasing the electron-disorder scattering length via mild ion bombardment. These results imply that viscous electron flow is omnipresent in graphene devices, even at moderate mobility.
Submission history
From: Sayanti Samaddar Dr. [view email][v1] Sun, 21 Mar 2021 19:16:03 GMT (25427kb,D)
[v2] Mon, 13 Sep 2021 20:12:04 GMT (22533kb,D)
[v3] Fri, 17 Dec 2021 10:25:07 GMT (22532kb,D)
[v4] Sun, 16 Jan 2022 19:35:11 GMT (22532kb,D)
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