Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 71: Ultra-cold plasmas and Rydberg systems

Q 71.1: Vortrag

Freitag, 16. März 2012, 14:00–14:15, V57.03

Dynamical phases and intermittency of a dissipative Rydberg lattice gas — •Cenap Ates, Beatriz Olmos, Juan P. Garrahan, and Igor Lesanovsky — School of Physics and Astronomy, The University of Nottingham, Nottingham, NG7 2RD, United Kingdom

Taking into account the radiative decay of Rydberg states, we use a Rydberg lattice gas to implement a dissipative quantum Ising model. For a certain range of values of the spin-spin coupling, transverse magnetic field and dissipation rate, we identify a first order dynamical phase transition between active and inactive dynamical phases. We demonstrate that dynamical phase-coexistence becomes manifest in an intermittent behavior of bath quanta emission. Moreover, we illuminate the connection between the dynamical order parameter that quantifies activity, and the longitudinal magnetization that conventionally serves as static order parameter. We investigate the dynamical phases of the system using the concept of "thermodynamics of quantum jump trajectories" on a mean field level. The physical picture thus obtained is fully supported by Quantum Jump Monte Carlo simulations.