קולוקוויום בפיזיקה: Negative resistance and other wonders of viscous electronics in graphene

Abstract:

Quantum-critical strongly correlated systems feature universal collision-dominated collective transport. Viscous electronics is an emerging field dealing with systems in which strongly interacting electrons flow like a fluid. We identified vorticity as a macroscopic signature of electron viscosity and linked it with a striking macroscopic DC transport behavior: viscous friction can drive electric current against an applied field, resulting in a negative voltage, recently measured experimentally in graphene. Negative resistance  plays the same role for the viscous regime as zero resistance does for superconductivity. I shall also describe current vortices, expulsion of electric field, conductance exceeding the fundamental quantum-ballistic limit and other wonders of viscous electronics. Strongly interacting electron-hole plasma in high-mobility graphene affords a unique link between quantum-critical electron transport and the wealth of fluid mechanics phenomena.

http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3667.html

https://arxiv.org/abs/1607.00986  PRL accepted

http://arxiv.org/abs/1607.07269 PNAS accepted

מארגן האירוע: ד"ר ערן סלע