期刊
NATURE PHYSICS
卷 12, 期 7, 页码 672-676出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3667
关键词
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资金
- Center for Integrated Quantum Materials (CIQM) under NSF [1231319]
- US Army Research Laboratory
- US Army Research Office through Institute for Soldier Nanotechnologies [W911NF-13-D-0001]
- MISTI MIT-Israel Seed Fund
- Israeli Science Foundation [882]
- Russian Science Foundation [14-22-00259]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1231319] Funding Source: National Science Foundation
- Russian Science Foundation [14-22-00259] Funding Source: Russian Science Foundation
Quantum-critical strongly correlated electron systems are predicted to feature universal collision-dominated transport resembling that of viscous fluids(1-4). However, investigation of these phenomena has been hampered by the lack of known macroscopic signatures of electron viscosity(5-9). Here we identify vorticity as such a signature and link it with a readily verifiable striking macroscopic d.c. transport behaviour. Produced by the viscous flow, vorticity can drive electric current against an applied field, resulting in a negative nonlocal voltage. We argue that the latter may play the same role for the viscous regime as zero electrical resistance does for superconductivity. Besides offering a diagnostic that distinguishes viscous transport from ohmic currents, the sign-changing electrical response affords a robust tool for directly measuring the viscosity-to-resistivity ratio. A strongly interacting electron-hole plasma in high-mobility graphene(10-12) affords a unique link between quantum-critical electron transport and the wealth of fluid mechanics phenomena.
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