SCL Seminar by Wassilij Kopylov

On September 26, 2014, at 14:00, in the library of the Institute of Physics Belgrade, Wassilij Kopylov (Institute for Theoretical Physics, Technical University of Berlin, Germany)  presents a seminar talk entitled:

"Time-delayed feedback control of the Dicke-Hepp-Lieb superradiant quantum phase transition"


In this talk we will present an application of the time-delayed Pyragas control scheme to the dissipative Dicke model via a modulation of the atom-field-coupling. The feedback creates an infinite sequence of non-equilibrium phases with fixed points and limit cycles in the primary superradiant regime. We will analyse this Hopf bifurcation scenario as a function of delay time and feedback strength, and determine analytical conditions for the phase boundaries.