ITAMP Topical Lunch Discussion
This week, we will have two lunch discussions: Tuesday and Friday. Note
different time and location for Tuesday.
Date: TUESDAY, April 22
Time: 12:30-2:00 pm
Pizza will be served.
Location: B-105 @ Center for Astrophysics (60 Garden Street)
Directions: after entering the lobby of the CfA, turn right to enter the
hallway of the B building. In the hallway, turn right again, and B-105 is
there.
*Speaker*: Prof. Igor Lesanovsky (University of Nottingham)
*Title:* Dynamical Phases of Open Quantum Systems
*Abstract:* 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
characterise their non-equilibrium properties we make use of the
unravelling of the dynamics in terms of stochastic quantum jump
trajectories. To classify dynamical phases we introduce as a dynamical
order parameter the number of quantum jumps in a specific time interval.
This approach rather naturally leads to a framework (called the s-ensemble)
that permits an understanding of the non-equilibrium phase structure from a
perspective that is very similar 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 discuss a dissipative version of the
quantum Ising model where such intermittency 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
displays a dynamical transition which is not accompanied by a change in the
stastics. This feature results in non-trivial and strongly correlated
relaxation behaviour.
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