Dresden 2009 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Correlated Electrons: Quantum-Critical Phenomena 2
TT 22.9: Talk
Wednesday, March 25, 2009, 12:00–12:15, HSZ 03
Nonequilibrium quantum criticality in open electronic systems — •So Takei1,2, Aditi Mitra3, William Witczak-Krempa1, Yong Baek Kim1, and Andrew J. Millis4 — 1University of Toronto, Toronto, Canada — 2Max-Planck-Institute for Solid State Research, Stuttgart, Germany — 3New York University, New York, U.S.A. — 4Columbia University, New York, U.S.A.
A theory is presented of quantum criticality in open (coupled to reservoirs) itinerant electron magnets, with nonequilibrium drive provided by current flow across the system. Both departures from equilibrium at conventional (equilibrium) quantum critical points and the physics of phase transitions induced by the nonequilibrium drive are treated. Nonequilibrium-induced phase transitions are found to have the same leading critical behavior as conventional thermal phase transitions. The theory is also extended to the case of a coupled bilayer system of itinerant electron magnets where coupled critical dynamics between the two order parameters becomes possible.