Journal
SCIENCE
Volume 351, Issue 6277, Pages 1055-1058Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad0201
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Funding
- European Research Council
- Royal Society
- Lloyd's Register Foundation
- Graphene Flagship
- Italian Ministry of Education, University and Research
- Marie Curie program SPINOGRAPH (Spintronics in Graphene)
- Nederlandse Wetenschappelijk Organisatie
- Engineering and Physical Sciences Research Council
- EPSRC [EP/K005014/1, EP/G02491X/1, EP/M003167/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1353100, EP/G02491X/1, EP/K005014/1, 1082880, EP/M003167/1] Funding Source: researchfish
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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-size whirlpools in the electron flow. The viscosity of graphene's electron liquid is found to be similar to 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.
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