title: Entanglement and dynamics of spin chains in periodically pulsed magnetic fields: accelerator modes.
abstract: We study the dynamics of a single excitation in a Heisenberg spin-chain subjected to a sequence of periodic pulses from an external, parabolic, magnetic field. We show that, for experimentally reasonable parameters, a pair of counterpropagating coherent states is ejected from the center of the chain. We find an illuminating correspondence with the quantum time evolution of the well-known paradigm of quantum chaos, the quantum kicked rotor. From this we can analyze the entanglement production and interpret the ejected coherent states as a manifestation of the so-called "accelerator modes" of a classically chaotic system.
authors.affiliation: Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
authors.forename: T
authors.initials: T
authors.lastname: Boness
authors.forename: S
authors.initials: S
authors.lastname: Bose
authors.forename: T S
authors.initials: TS
authors.lastname: Monteiro