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SUMMARY:Non-equilibrium dynamics of open quantum system - Dr Igor Lesanovs
 ky\, University of Nottingham
DTSTART:20131010T131500Z
DTEND:20131010T144500Z
UID:TALK46810@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:In the talk I will give an overview of our recent work on the 
 non-equilibrium dynamics of open many-body quantum systems. These systems 
 are described by a quantum Master equation of Lindblad form. To characteri
 se their non-equilibrium properties we make use of the unravelling of the 
 dynamics in terms of stochastic quantum jump trajectories. To classify dyn
 amical phases we introduce as a dynamical order parameter the number of qu
 antum jumps in a specific time interval. This approach rather naturally le
 ads to a framework (called the s-ensemble) that permits an understanding o
 f the non-equilibrium phase structure from a perspective that is very simi
 lar to that of equilibrium statistical mechanics. I will first demonstrate
  the approach for a driven three-level atom diplaying intermittency in its
  quantum jumps which is controlled by the driving fields. Then I will disc
 uss a dissipative version of the quantum Ising model where such intermitte
 ncy occurs as well but unlike in the previous case is a genuine many-body 
 effect. Finally\, I will focus on a strongly interacting many-body system 
 with kinetic constraints that can be realised with cold excited atoms. Thi
 s system displays a dynamical transition which is not accompanied by a cha
 nge in the stastics. This feature results in non-trivial and strongly corr
 elated relaxation behaviour which is reminiscent of glasses.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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