期刊
NATURE COMMUNICATIONS
卷 9, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-07004-4
关键词
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资金
- Simons Center for Geometry and Physics
- Marie Curie program SPINOGRAPH
- Graphene Flagship
- European Research Council
- EPSRC Doctoral Prize fellowship
- ISF [882]
- RSF [14-22-00259]
- Center for Integrated Quantum Materials under NSF [DMR-1231319]
- Army Research Office [W911NF-18-1-0116]
- Leverhulme Trust
- Minerva Foundation
- EPSRC [EP/K005014/1] Funding Source: UKRI
- Russian Science Foundation [17-22-00017] Funding Source: Russian Science Foundation
Viscous electron fluids have emerged recently as a new paradigm of strongly-correlated electron transport in solids. Here we report on a direct observation of the transition to this long-sought-for state of matter in a high-mobility electron system in graphene. Unexpectedly, the electron flow is found to be interaction-dominated but non-hydrodynamic (quasiballistic) in a wide temperature range, showing signatures of viscous flows only at relatively high temperatures. The transition between the two regimes is characterized by a sharp maximum of negative resistance, probed in proximity to the current injector. The resistance decreases as the system goes deeper into the hydrodynamic regime. In a perfect darkness-before daybreak manner, the interaction-dominated negative response is strongest at the transition to the quasiballistic regime. Our work provides the first demonstration of how the viscous fluid behavior emerges in an interacting electron system.
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