Negative local resistance caused by viscous electron backflow in graphene

D. A. Bandurin, I. Torre, R. Krishna Kumar, M. Ben Shalom, A. Tomadin, A. Principi, G. H. Auton, E. Khestanova, K. S. Novoselov, I. V. Grigorieva, L. A. Ponomarenko, A. K. Geim, M. Polini

Research output: Contribution to journalArticlepeer-review

Abstract

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 these conditions, electrons can behave as a viscous liquid and exhibit hydrodynamic phenomena similar to classical liquids. Here we report strong evidence for this transport regime.We found that doped graphene exhibits an anomalous (negative) voltage drop near current-injection contacts, which is attributed to the formation of submicrometer-sizewhirlpools in the electron flow.The viscosity of graphene's electron liquid is found to be ~0.1 squaremeters per second, an order of magnitude higher than that of honey, in agreement with many-body theory. Our work demonstrates the possibility of studying electron hydrodynamics using high-quality graphene.

Original languageEnglish
Pages (from-to)1055-1058
Number of pages4
JournalScience
Volume351
Issue number6277
DOIs
StatePublished - 4 Mar 2016
Externally publishedYes

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