Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 34: Nonequilibrium Quantum Many-Body Systems 2

TT 34.7: Vortrag

Dienstag, 2. April 2019, 15:00–15:15, H22

Exploring in the dynamical quantum phase transition theory the presence of a quantum critical region close to the critical time — •Daniele Trapin and Markus Heyl — Max Planck Institute for the Physics of Complex Systems Nöthnitzer Straße 38 D-01187 Dresden

The presence of dynamical quantum phase transitions(DQPTs) with properties resembling those of the continuous phase transitions, suggests to investigate the existence of a quantum critical region in the proximity of the critical time. This region plays a fundamental role in the theory of quantum phase transition, since it allows to prove experimentally the presence of the quantum critical point. This is achieved because the physical features at the critical point are extended to nonzero temperature and for a small range of the control parameter around the critical point. In the out-of-equilibrium regime, we study the presence of a dynamical quantum critical region close to the critical time. In this context, to get an analogous picture with the equilibrium case, we have to substitute the control parameter with time, and temperature with the energy density.