Graphene - a nearly perfect fluid

Details Graphene - a nearly perfect fluid Graphene - a nearly perfect fluid

2009-03-24

arxiv.org/abs/0903.4178v2

Phys. Rev. Lett. 103, 025301 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 2 figures, published version

Scientific paper

Hydrodynamics and collision dominated transport are crucial to understand the slow dynamics of many correlated quantum liquids. The ratio \eta/s of the shear viscosity \eta to the entropy density s is uniquely suited to determine how strongly the excitations in a quantum fluid interact. We determine \eta/s in clean undoped graphene using a quantum kinetic theory. As a result of the quantum criticality of this system the ratio is smaller than in many other correlated quantum liquids and, interestingly, comes close to a lower bound conjectured in the context of the quark gluon plasma. We discuss possible consequences of the low viscosity, including pre-turbulent current flow.

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