Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• Science (American Association for the Advancement of Science), 2016-03, Vol.351 (6277), p.1058-1061

Ort / Verlag

United States: American Association for the Advancement of Science

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Science Online_科学在线

Beschreibungen/Notizen

• 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.