Hydrodynamic flow in graphene – Quantum criticality, Plackian dissipation and black holes

Abstract

The gauge/gravity duality maps strongly correlated quantum condensed matter systems onto holographic models of gravity and provides a non-perturbative approach towards predicting its transport properties. In graphene, when the electron-electron scattering becomes more frequent than the scattering of electrons by phonons or disorder, the electrons gas behaves as a hydrodynamic fluid and expected to exhibit emergent universalities in dc charge and heat transport close to the charge neutrality where graphene becomes quantum critical. In this talk, I shall present some new experimental result on the electrical and thermal transport measurements in extremely high-quality graphene devices. I shall give evidence of the universal dc transport, breakdown of the Widemann-Franz law, and approach to the holographic limit of minimally dissipative flow of charge. We believe these experiments will lead to a new strategy to exploit high-quality graphene as a testing bed for some of the unifying concepts in physics.