1306.4989 (Matthew J. M. Power et al.)

Dynamical symmetry breaking with optimal control: reducing the number of
pieces    [PDF]

Matthew J. M. Power, Gabriele De Chiara

We analyse the production of defects during the dynamical crossing of a mean-field phase transition with a real order parameter. When the parameter that brings the system across the critical point changes in time according to a power-law schedule, we recover the predictions dictated by the well-known Kibble-Zurek theory. For a fixed duration of the evolution, we show that the average number of defects can be drastically reduced for a very large but finite system, by optimising the time dependence of the driving using optimal control techniques. Furthermore, the optimised protocol is robust against small fluctuations.

View original: http://arxiv.org/abs/1306.4989