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

• Autores: Jesse Crossno, Jing Shi, Ke Wang, Xiaomeng Liu
• Localización: Science, ISSN 0036-8075, Vol. 351, Nº 6277, 2016, págs. 1058-1061
• Idioma: inglés
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• Resumen

  • 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.