Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 82: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems 2

TT 82.4: Vortrag

Donnerstag, 10. März 2016, 17:15–17:30, H22

Scaling and Universality at Dynamical Quantum Phase Transitions — •Markus Heyl — Technische Universität München

Dynamical quantum phase transitions have recently emerged as a nonequilibrium analogue to conventional phase transitions with physical quantities becoming nonanalytic at critical times. However, a major challenge is to connect to fundamental concepts such as scaling and universality that are intimately related to renormalization group theory and the associated fixed points. In this talk I will show that for dynamical quantum phase transitions in Ising models exact renormalization group transformations in complex parameter space can be formulated. As a result of this construction, the dynamical quantum phase transitions are critical points associated with unstable fixed points of equilibrium Ising models implying scaling and universality. Moreover, signatures of these transitions in the dynamical buildup of spin correlations will be presented with an associated temporal power-law scaling determined solely by the fixed point universality class.