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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics IV

Q 58.15: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Many-body phases emerging from the competition between long-range and short-range potentials — •Rebecca Kraus¹, Katharina Rojan¹, Hessam Habibian^2,3, and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ²Departament de Física, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Spain — ³Institut de Ciéncies Fotóniques (ICFO), Mediterranean Technology Park, E-08860 Castelldefels (Barcelona), Spain

We consider the Bose-Hubbard model for ultracold bosonic atoms confined by an optical lattice inside an optical resonator. The atoms interact with a cavity mode whose wavelength is incommensurate with the spatial periodicity of the confining potential, as considered in [1]. We consider a two-dimensional gas and identify the parameter tuning the strength of the long-range cavity mediated potential and the onsite interaction. In absence of the cavity, the second incommensurate potential is absent and the well-known Superfluid-Mott insulator transition is found. For small cavity fields, the cavity potential stabilizes glassy phases at sufficiently small kinetic energy [1]. We complete the diagram by analysing the situation, when the cavity potential is dominant over the onsite interaction and discuss the nature of the phases we identifiy.

[1] H.Habibian et al., Phys. Rev. Lett. 110, 075304 (2013)