Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Cold atoms III - optical lattices (joint session A/Q)

Q 11.5: Talk

Monday, March 5, 2018, 15:00–15:15, K 0.011

Robust features of Bose-Hubbard eigenstates dressed by a cavity — •Jonas Mielke, Laurent de Forges de Parny, and Andreas Buchleitner — Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Straße 3, D-79104, Freiburg, Germany

The coherent dressing by a cavity field allows to induce long-range interactions between otherwise only locally interacting bosons in optical lattices [1]. Most studies did so far address ground state properties like long-range phase coherence and spatial ordering [2,3], while also the excitation spectrum of these systems can be expected to exhibit non-trivial structural features. We present a complete map of the system states' characteristic structural features, across the entire excitation spectrum, which generalizes standard ground state phase diagrams, for minimal system sizes. We discuss the physical mechanisms which define the smooth demarcation lines between different structural properties in parameter space, and analyse relevant scaling properties with the system size.

[1] C. Maschler, I. Mekhov, and H. Ritsch, Eur. Phys. J. D,46, 545-560 (2008);

[2] R. Landig, L. Hruby, N. Dogra, M. Landini, R. Mottl, T. Donner, and T. Esslinger, Nature 532, 476 (2016);

[3] T. Flottat, L. de Forges de Parny, F. Hébert, V.G. Rousseau, and G.G. Batrouni, Phys. Rev. B 95, 144501 (2017).