Viscous electron transport
In my talk I will first report on results of combined theoretical and experimental work showing unambiguous evidence for the long-sought hydrodynamic solid-state transport regime. In particular, I will discuss how high-quality doped graphene sheets above liquid nitrogen temperatures exhibit negative non-local resistance near current injection points and whirlpools in the spatial current pattern. Measurements of these non-local electrical signals allow to extract the value of the kinematic viscosity of the two-dimensional electron liquid in graphene, which is found to compare well with many-body theoretical predictions. I will then discuss super-ballistic transport across a point contact as induced by viscosity and ideas on how to probe hydrodynamic behavior via the use of engineered short-wavelength plasmon-phonon polaritons in hybrid stacks containing graphene, Boron Nitride, and metal gates.
Work is supported by the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 785219 – GrapheneCore2.