Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Correlated Electrons: Quantum-Critical Phenomena 2

TT 22.9: Vortrag

Mittwoch, 25. März 2009, 12:00–12:15, HSZ 03

Nonequilibrium quantum criticality in open electronic systems — •So Takei^1,2, 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.