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.
Show replies by date