Back to Search
Start Over
Observation of the Dirac fluid and the breakdown of the Wiedemann-Franz law in graphene
- Source :
- Science 351, 1058 (2016)
- Publication Year :
- 2015
-
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, due to decoupling of charge and heat currents within hydrodynamics. Employing high sensitivity Johnson noise thermometry, we report the breakdown of the Wiedemann-Franz law in graphene, with a thermal conductivity an order of magnitude larger than the value predicted by Fermi liquid theory. This result is a signature of the Dirac fluid, and constitutes direct evidence of collective motion in a quantum electronic fluid.<br />Comment: 5+5 pages, 3+7 figures
Details
- Database :
- arXiv
- Journal :
- Science 351, 1058 (2016)
- Publication Type :
- Report
- Accession number :
- edsarx.1509.04713
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1126/science.aad0343