title: Nonequilibrium phase transition in a periodically driven XY spin chain.
abstract: We present a general formulation of Floquet states of periodically time-dependent open Markovian quasifree fermionic many-body systems in terms of a discrete Lyapunov equation. Illustrating the technique, we analyze periodically kicked XY spin-½ chain which is coupled to a pair of Lindblad reservoirs at its ends. A complex phase diagram is reported with reentrant phases of long range and exponentially decaying spin-spin correlations as some of the system's parameters are varied. The structure of phase diagram is reproduced in terms of counting nontrivial stationary points of Floquet quasiparticle dispersion relation.
authors: Department of Physics, FMF, University of Ljubljana, Slovenia.
authors: Tomaž
authors: T
authors: Prosen
authors: Enej
authors: E
authors: Ilievski