Статья

Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene

Jesse CrossnoDepartment of Physics, Harvard University, Cambridge, MA 02138, USAJing ShiDepartment of Physics, Harvard University, Cambridge, MA 02138, USAKe WangDepartment of Physics, Harvard University, Cambridge, MA 02138, USAXiaomeng LiuDepartment of Physics, Harvard University, Cambridge, MA 02138, USAAchim HarzheimDepartment of Physics, Harvard University, Cambridge, MA 02138, USAAndrew LucasDepartment of Physics, Harvard University, Cambridge, MA 02138, USASubir SachdevDepartment of Physics, Harvard University, Cambridge, MA 02138, USAPhilip KimDepartment of Physics, Harvard University, Cambridge, MA 02138, USATakashi TaniguchiNational Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanKenji WatanabeNational Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanThomas OhkiQuantum Information Processing Group, Raytheon BBN Technologies, Cambridge, MA 02138, USAKin Chung FongQuantum Information Processing Group, Raytheon BBN Technologies, Cambridge, MA 02138, USA

2016en

ABI

Аннотация

Interactions between particles in quantum many-body systems can lead to collective behavior described by hydrodynamics. One such system is the electron-hole plasma in graphene near the charge-neutrality point, which can form a strongly coupled Dirac fluid. This charge-neutral plasma of quasi-relativistic fermions is expected to exhibit a substantial enhancement of the thermal conductivity, thanks to decoupling of charge and heat currents within hydrodynamics. Employing high-sensitivity Johnson noise thermometry, we report an order of magnitude increase in the thermal conductivity and the breakdown of the Wiedemann-Franz law in the thermally populated charge-neutral plasma in graphene. This result is a signature of the Dirac fluid and constitutes direct evidence of collective motion in a quantum electronic fluid.

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Идентификаторы

DOI: 10.1126/science.aad0343

Цитирования и источники

Цитирований: 2Использованных источников: 0

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