Abstract:
It is an emerging field dealing with systems in which strongly interacting electrons flow like a fluid. Such flows have some remarkable properties never seen before. I shall describe some recent theoretical and experimental works devoted, in particular, to a striking macroscopic DC transport behavior: viscous friction can drive electric current against an applied field, resulting in a negative resistance, recently measured experimentally in graphene. I shall also describe conductance exceeding the fundamental quantum-ballistic limit, freely-flowing viscous flows, field-theoretical anomalies, direct observation of macroscopic vortices and the new regime of para-hydrodynamics. Strongly interacting electron-hole plasma in high-mobility graphene and other high-mobility materials affords a unique link between quantum-critical electron transport and the wealth of fluid mechanics phenomena.