title: Dynamical singularities of glassy systems in a quantum quench.
abstract: We present a prototype of behavior of glassy systems driven by quantum dynamics in a quenching protocol by analyzing the random energy model in a transverse field. We calculate several types of dynamical quantum amplitude and find a freezing transition at some critical time. The behavior is understood by the partition-function zeros in the complex temperature plane. We discuss the properties of the freezing phase as a dynamical chaotic phase, which are contrasted to those of the spin-glass phase in the static system.
authors.affiliation: Cybermedia Center, Osaka University, Osaka 560-0043, Japan.
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Obuchi
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Takahashi
mesh_terms: D003198:Computer Simulation; D005898:Glass / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D044367:Phase Transition; D011789:Quantum Theory