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Q: Fachverband Quantenoptik und Photonik

Q 40: Poster: Quantum Optics and Photonics II

Q 40.2: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG2

Bose-Hubbard ladder in a cavity-induced artificial magnetic field — •Catalin-Mihai Halati, Ameneh Sheikhan, and Corinna Kollath — HISKP, University of Bonn, Nussallee 14-16, 53115 Bonn, Germany

We consider ultra-cold interacting bosonic atoms confined to quasi-one-dimensional ladder structures formed by optical lattices and coupled to the field of an optical cavity. The atoms can tunnel along the leg direction and collect a spatial phase imprint during the tunneling along a rung. The phase imprint is realized via Raman transition employing a cavity mode and a transverse running wave pump beam. By adiabatic elimination of the cavity field we obtain an effective Hamiltonian for the bosonic atoms, which needs to be analyzed self-consistently. We characterize the system by performing a Bogoliubov theory for quasiparticles excitations on top of the bosonic condensate, whose spectrum has characteristic features of the superfluid phase. In this framework we solve the self-consistency condition and identify the steady states that can occur.