Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Quantum gases: Interaction effects II
Q 23.2: Vortrag
Dienstag, 19. März 2013, 11:30–11:45, E 001
Spin and Photon Glasses in Open Quantum Systems — •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
Recent studies of strongly interacting atoms and photons in optical cavities have triggered the interest in open system realizations of the Dicke model of atomic qubits coupled to discrete photon cavity modes. In the framework of a non-equilibrium Keldysh path integral approach tailored to study open quantum systems with disorder, we analyze the open multi-mode Dicke model with variable atom-photon couplings and cavity photon loss. In spite of the dissipative nature of this model, we identify a spin glass phase as a possible steady state of the system. The glassy system shows low frequency thermalization and unusual spectral behavior of the atoms as well as a strong competition between relaxational and reversible dynamics close to the glass transition. As a main feature, the physical properties of the spin glass are completely mapped onto the photonic degrees of freedom, which, as we demonstrate, makes spin glass physics directly observable in cavity QED experiments.