Graphene - a nearly perfect fluid

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Date/Time:Thursday, 03 Dec 2009 - Thursday, 03 Dec 2009
Location:Physics 5
Contact:Adam Kaminski
Phone:515-294-0849
Channel:Condensed Matter Physics
Actions:Download iCal/vCal | Email Reminder
Joerg Schmalian, Iowa State University

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.