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DTSTAMP:20230324T022234Z
UID:https://www.mpsd.mpg.de/events/18952/333641
DTSTART:20190612T123000Z
DTEND:20190612T140000Z
CLASS:PUBLIC
CREATED:20190606T123929Z
DESCRIPTION:Driven-dissipative systems represent natural platforms to study
non-equilibrium phases. In the first part of the talk\, I will present so
me physical results for which both non-equilibrium conditions and interact
ions are crucial. I will argue that a prototype model of correlated driven
-dissipative lattice bosons\, relevant for upcoming generation of circuit
QED arrays experiments\, exhibits a phase transition where a finite freque
ncy mode becomes unstable\, as an effect of quantum interactions and non-e
quilibrium conditions. In the broken-symmetry phase the corresponding macr
oscopic order parameter becomes non-stationary and oscillates in time with
out damping\, thus breaking continuous time-translational symmetry. To get
some more insights on this transition\, I studied the spectral properties
of Markovian driven-dissipative quantum systems using a Lehmann represent
ation. Focusing on the nonlinear quantum Van der Pol oscillator as a parad
igmatic example\, I showed that a sign constraint of spectral functions\,
which is mathematically exact for closed systems\, gets relaxed for open s
ystems\; it is eventually replaced by an interplay between dissipation and
interactions. In the last part of the talk\, I will finally discuss a new
method to solve quantum impurity models\, small interacting quantum syste
ms coupled to a non-Markovian environment\, in presence of additional Mark
ovian dissipation. I will derive a Dyson equation for the time-evolution o
perator of the reduced density matrix and approximate its self-energy resu
ming only non-crossing diagrams. I will test this approach on a simple pro
blem of a fermionic impurity.\, Speaker: Orazio Scarlatella
LAST-MODIFIED:20190606T124053Z
LOCATION:CFEL (Bldg. 99)\, Room: Seminar Room O1.060
ORGANIZER:Michael Sentef
SUMMARY:MPSD Seminar: Correlated driven-dissipative systems
URL:https://www.mpsd.mpg.de/events/18952/333641
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