Graphene - a nearly perfect fluid
|Date/Time:||Thursday, 03 Dec 2009 - Thursday, 03 Dec 2009|
|Channel:||Condensed Matter Physics|
Hydrodynamics and collision dominated transport are crucial to understand the slow dynamics of many correlated quantum liquids. The ratio of the shear viscosity to the entropy density is uniquely suited to determine how strongly the excitations in a quantum fluid interact. This ratio is determined 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.