Regensburg 2016 – wissenschaftliches Programm
PV XIII: Preisträgervortrag
Mittwoch, 9. März 2016, 13:15–13:45, H15
Spontaneous symmetry breaking out of equilibrium: Kibble-Zurek mechanism in colloidal monolayers — •Peter Keim1,2, Sven Deutschländer1, Georg Maret1, and Patrick Dillmann1 — 1University of Konstanz, Germany — 2Laureate of the Gustav-Hertz-Prize
The Kibble-Zurek mechanism (KZM) describes the evolution of defects and domains when a system is forced through a phase transition with spontaneously broken symmetry. It is used to describe transitions on such different scales like the Higgs field in the early universe shortly after the Big Bang  or condensed matter systems like quenched quantum fluids . Cooling at a finite rate, a domain structure naturally arises for a system with continuous phase transition. Due to critical slowing down, the system has to fall out of equilibrium in the vicinity of the transition for any non-zero cooling rate; at this so called fall out time, a fingerprint of critical fluctuations is taken. Within this picture, we investigate the non-equilibrium dynamics in a soft-matter analogue, a two-dimensional ensemble of colloidal particles which in equilibrium obeys the Kosterlitz-Thouless-Halperin-Nelson-Young melting scenario (KTHNY-theory). We show that the frozen-out length scale follows the prediction as function of the quench rate, if Kibble-Zurek mechanism is adopted to the KTHNY universality .
 T. Kibble, J. Phys. Math. Gen. 9 1387 (1976)  W. Zurek, Nature 317 505 (1985)  S. Deutschländer, P. Dillmann, G. Maret, P. Keim, Proc. Natl. Acad. Sci. 112 6925 (2015)