Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.39: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Glass Physics in Open Quantum Systems: A Keldysh Path Integral Approach — •Michael Buchhold1, Philipp Strack2, and Sebastian Diehl1,3 — 1Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria — 2Department of Physics, Harvard University, Cambridge MA 02138 — 3Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria
We investigate non-equilibrium phase transitions in an open cavity system with random atom-photon couplings and cavity photon loss. This system shows normal and superradiant phases, as well as a transition to an atomic spin glass phase for fluctuating atom-photon couplings. The physical behavior close to the glass transition reflects the strong competition between relaxational and reversible dynamics, including low frequency thermalization and the non-equilibrium scaling behavior at the transition.
For a theoretical describtion, we develop a functional integral approach in Keldysh framework, tailored to describe steady state properties and non-equilibrium time-evolution for open quantum many-body systems. This approach allows to combine the strengths of functional integral methods, including perfect access to critical phenomena in large systems, with well established methods from quantum optics, as for instance the input-output formalism and further detection schemes. This is used to show how the above mentioned results can be detected in cavity QED experiments.