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TT: Fachverband Tiefe Temperaturen

TT 96: Correlated Electrons: Nonequilibrium Quantum Many-Body Systems II

TT 96.6: Vortrag

Donnerstag, 3. April 2014, 16:15–16:30, HSZ 304

Universal post-quench dynamics at quantum critical points — •Pia Gagel¹, Peter P. Orth¹, and Jörg Schmalian^1,2 — ¹Institute for Theory of Condensed Matter, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Institute for Solid State Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany

We consider a quench in a system initially located in the vicinity of a quantum critical point and that is suddenly moved to the critical point. In this regime one finds a universal exponent that is not related to the equilibrium exponents and that governs the post-quench short time dynamics. We calculate this exponent for an open quantum system and discuss the implications for the dynamics of the order parameter and response functions. The approach demonstrates that quantum-quenches can be efficient tools to manipulate and study quantum many body systems.