CENTER FOR QUANTUM MATERIALS AND CONDENSED MATTER PHYSICS SEMINARS

NEWS: The CQM Distinguished Lecture series has been established  in the Fall of 2015 to bring to Stony Brook University the renown experts in the physics of quantum matter.

The lectures in this series will attract a broad audience of physicists from SBU and BNL,
and SBU graduate students.
Mar
24
Fri
Samuel Ponce, Oxford.
Mar 24 @ 1:30 pm – 2:30 pm
Apr
21
Fri
Dr. Kin Chung Fong (Raytheon BBN Technologies): Putting hydrodynamic into solid state
Apr 21 @ 1:30 pm – 2:30 pm

Dr. Kin Chung Fong, Raytheon BBN Technologies

Putting hydrodynamic into solid state

Despite of the strong Coulomb interaction, electrons in simple metal behave as a non-interacting Fermi gas with long-lived quasi-particle excitation. However, weak screening near the charge neutrality point of the massless Dirac fermions in graphene can lead to a new collective behavior described by hydrodynamics. By listening to the Johnson noise of the electrons, we are able to probe simultaneously the thermal and electrical transport of the Dirac fluid and observe how it departs from Fermi liquid physics. At high temperature near the neutrality point, we find a strong enhancement of the thermal conductivity and breakdown of Wiedemann-Franz law in graphene. This is attributed to the non-degenerate electrons and holes forming a strongly coupled Dirac fluid.

Ref: Science 351, 1058 (2016)