Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session X05: Hydrodynamic electron flow in topological materials
8:00 AM–11:00 AM,
Friday, March 9, 2018
LACC Room: 152
Sponsoring Units: DCMP DMP
Chair: Stuart Parkin
Abstract: X05.00003 : Transport without quasiparticles in graphene and Weyl semi-metals*
9:12 AM–9:48 AM
View Presentation Abstract
(Physics, Stanford University)
Graphene and Weyl semi-metals have electronic excitations with a massless Dirac spectrum. At charge neutrality, the long-range Coulomb interaction remains unscreened, and electronic quasiparticles are not well defined. In sufficiently clean samples, thermal and electrical transport enters a hydrodynamic regime: insights on the nature of transport in this regime have emerged from holographic connections to the dynamics of black holes. A large enhancement of the Wiedemann-Franz ratio of the thermal and electrical conductivities was predicted, and is in good agreement with observations on graphene. In Weyl semi-metals, an axial-gravitational anomaly was employed to predict magnetotransport properties, and is consistent with a positive longitudinal magnetothermoelectric conductance observed in NbP.
*This research was supported by the Gordon and Betty Moore Foundation EPiQS Initiative through Grant GBMF4306, by the National Science Foundation under Grant DMR-1360789 and Multi-University Research Initiative Grant W911NF-14-1-0003 from the Army Research Office.
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