Open Conference Systems, StatPhys 27 Main Conference

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Physical swaps in the non-equilibrium dynamics of cold atomic systems
Ricardo Gutierrez

##manager.scheduler.building##: Edificio Santa Maria
##manager.scheduler.room##: Auditorio San Agustin
Date: 2019-07-08 11:45 AM – 03:30 PM
Last modified: 2019-06-15

Abstract


Cold gases of highly excited (Rydberg) atoms are dynamically arrested due to the effective kinetic constraints that arise from their strong interactions. In fact, their seemingly glassy behavior in the presence of strong dissipation has been shown to be governed by a dynamic phase transition similar to those which have been found in simple models of the glass transition [1]. When the transition between the ground state and more than one excited level is considered, their interactions may give rise to excitation exchange processes [2]. While these are analogous to particle swaps used in the numerical study of atomistic models of classical glass formers, which have been shown to provide dynamical shortcuts to relaxation [3], there is one crucial difference: in cold atomic systems such swaps are in fact real physical processes. Moreover, their impact on the structure and dynamics of the non-equilibrium stationary states is considerable: not only do they reduce the characteristic timescales by many orders of magnitude, but they also have a strong influence on the static properties non-equilibrium stationary state, and their interplay with radiative decay processes increases the irreversibility of the dynamics as quantified by the entropy production rate [4]. While swap Monte Carlo methods have been in use for over a decade, and their theoretical implications have been the focus of much recent attention, to our knowledge, this is the first time that a system where physical swaps are experimentally relevant is investigated.

[1] C. Pérez-Espigares, I. Lesanovsky, J. P. Garrahan, and R. Gutiérrez, Phys. Rev. A (Rapid Communications, Editors’ Suggestion) 98, 021804(R) (2018).

[2] R. Gutiérrez, J. P. Garrahan, and I. Lesanovsky, New J. Phys. 18, 093054 (2016).

[3] T. S. Grigera and G. Parisi, Phys. Rev. E 63, 045102 (2001).

[4] R. Gutiérrez, J. P. Garrahan, and I. Lesanovsky, arXiv:1812.02819 (2019).