Abstract:
: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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Bandurin DA,Shytov AV,Levitov LS,Kumar RK,Berdyugin AI,Ben Shalom M,Grigorieva IV,Geim AK,Falkovich Gdoi
10.1038/s41467-018-07004-4subject
Has Abstractpub_date
2018-10-31 00:00:00pages
4533issue
1issn
2041-1723pii
10.1038/s41467-018-07004-4journal_volume
9pub_type
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