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

Jesse Crossno, Jing K. Shi, Ke Wang, Xiaomeng Liu, Achim Harzheim, Andrew Lucas, Subir Sachdev, Philip Kim, Takashi Taniguchi, Kenji Watanabe, Thomas A. Ohki, Kin Chung Fong

Research output: Contribution to journalArticle

230 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1058-1061
Number of pages4
JournalScience
Volume351
Issue number6277
DOIs
StatePublished - Mar 4 2016
Externally publishedYes

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    Crossno, J., Shi, J. K., Wang, K., Liu, X., Harzheim, A., Lucas, A., Sachdev, S., Kim, P., Taniguchi, T., Watanabe, K., Ohki, T. A., & Fong, K. C. (2016). Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene. Science, 351(6277), 1058-1061. https://doi.org/10.1126/science.aad0343