Measuring Hall viscosity of graphene’s electron fluid

  title={Measuring Hall viscosity of graphene’s electron fluid},
  author={Alexey I. Berdyugin and S. G. Xu and F. M. D. Pellegrino and Roshan Krishna Kumar and Alessandro Principi and Iacopo Torre and Moshe Ben Shalom and Takashi Taniguchi and K. Watanabe and Irina V. Grigorieva and Marco Polini and SUPARNA DUTTASINHA and D. A. Bandurin},
  pages={162 - 165}
Electron hydrodynamics in graphene Electrons can move through graphene in a manner reminiscent of fluids, if the conditions are right. Two groups studied the nature of this hydrodynamic flow in different regimes (see the Perspective by Lucas). Gallagher et al. measured optical conductivity using a waveguide-based setup, revealing signatures of quantum criticality near the charge neutrality point. Berdyugin et al. focused on electron transport in the presence of a magnetic field and measured a… 

Imaging viscous flow of the Dirac fluid in graphene

Viscous Dirac fluid flow in room-temperature graphene is directly image by measuring the associated stray magnetic field, and viscosity and scattering rates are comparable to the universal values expected at quantum criticality, establishing a nearly ideal electron fluid in charge-neutral, high-mobility graphene at room temperature.

Evidence for Local Spots of Viscous Electron Flow in Graphene at Moderate Mobility.

Estimating the local scattering lengths from the gate dependence of local in-plane electric fields finds that electron-electron scattering dominates in these areas as expected for viscous flow, implying that viscous electron flow is omnipresent in graphene devices, even at moderate mobility.

Vorticity of viscous electronic flow in graphene

In ultra-pure materials electrons may exhibit a collective motion similar to the hydrodynamic flow of a viscous fluid, the phenomenon with far reaching consequences in a wide range of many body

Fluidity onset in graphene

This work provides the first demonstration of how the viscous fluid behavior emerges in an interacting electron system in graphene, and identifies a sharp maximum of negative resistance at the transition between the two regimes.

Local spots of viscous electron flow in graphene at room temperature and moderate mobility

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

Viscosity Enhancement by Electron-Hole Collisions in Dirac Electron Fluid

Rejuvenation of hydrodynamic transport in solids provides a new window to study collective motion of electrons, where electrons behave like a viscous fluid akin to classical liquids. Experimental

Imaging the breaking of electrostatic dams in graphene for ballistic and viscous fluids

The flow of charge carriers in materials can, under some circumstances, mimic the flow of viscous fluids. In order to visualize the consequences of such effects, new methodologies must be developed

Direct observation of vortices in an electron fluid.

Vortices are the hallmarks of hydrodynamic flow. Strongly interacting electrons in ultrapure conductors can display signatures of hydrodynamic behaviour, including negative non-local resistance1-4,

Hall effect in a ballistic flow of two-dimensional interacting particles

In high-quality solid-state systems at low temperatures, the hydrodynamic or the ballistic regimes of heat and charge transport are realized in the electron and the phonon systems. In these regimes,

Hall effect for Dirac electrons in graphene exposed to an Abrikosov flux lattice

The proposals for realizing exotic particles through coupling of quantum Hall effect to superconductivity involve spatially non-uniform magnetic fields. As a step toward that goal, we study, both



Negative local resistance caused by viscous electron backflow in graphene

Graphene hosts a unique electron system in which electron-phonon scattering is extremely weak but electron-electron collisions are sufficiently frequent to provide local equilibrium above the temperature of liquid nitrogen, under which electrons can behave as a viscous liquid and exhibit hydrodynamic phenomena similar to classical liquids.

Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene

Employing high-sensitivity Johnson noise thermometry, an order of magnitude increase in the thermal conductivity and the breakdown of the Wiedemann-Franz law is reported in the thermally populated charge-neutral plasma in graphene, a signature of the Dirac fluid and constitutes direct evidence of collective motion in a quantum electronic fluid.

Superballistic flow of viscous electron fluid through graphene constrictions

Graphene systems are clean platforms for studying electron–electron (e–e) collisions. Electron transport in graphene constrictions is now found to behave anomalously due to e–e interactions:

Fluidity onset in graphene

This work provides the first demonstration of how the viscous fluid behavior emerges in an interacting electron system in graphene, and identifies a sharp maximum of negative resistance at the transition between the two regimes.

Evidence for hydrodynamic electron flow in PdCoO2

Electrons that flow like a fluid Electrons inside a conductor are often described as flowing in response to an electric field. This flow rarely resembles anything like the familiar flow of water

Bulk and shear viscosities of the two-dimensional electron liquid in a doped graphene sheet

Hydrodynamic flow occurs in an electron liquid when the mean free path for electron-electron collisions is the shortest length scale in the problem. In this regime, transport is described by the

Hydrodynamics of electrons in graphene

  • A. LucasK. Fong
  • Physics
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2018
A review of recent progress in understanding the hydrodynamic limit of electronic motion in graphene is presented, written for physicists from diverse communities with no prior knowledge of hydrodynamics.

Thermal and electrical signatures of a hydrodynamic electron fluid in tungsten diphosphide

The observation of experimental signatures of hydrodynamic electron flow in the Weyl semimetal tungsten diphosphide is reported and it is found that both electrical and thermal transport are limited by the quantum indeterminacy.

Negative Magnetoresistance in Viscous Flow of Two-Dimensional Electrons.

It is concluded that 2D electrons in those structures in moderate magnetic fields should be treated as a viscous fluid, which is responsible for the giant negative magnetoresistance recently observed in the ultrahigh-mobility GaAs quantum wells.

Nonlocal transport and the hydrodynamic shear viscosity in graphene

Motivated by recent experimental progress in preparing encapsulated graphene sheets with ultrahigh mobilities up to room temperature, we present a theoretical study of dc transport in doped graphene