Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 70: Quantum gases: Lattices IV

Q 70.2: Talk

Friday, March 21, 2014, 16:45–17:00, UDL HS2002

Dimerized Mott insulators in driven hexagonal optical lattices — •Ole Jürgensen, Dirk-Sören Lühmann, and Klaus Sengstock — Institut für Laserphysik, Universität Hamburg

We numerically study driven optical honeycomb lattices and find dimerized insulator phases with fractional filling. These incompressible insulating phases are characterized by an interaction-driven localization of particles to individual dimers and a coherent superposition within the dimers. We calculate the ground state phase diagrams and the excitation spectra using an accurate cluster mean-field method as well as perturbation theory employing an effective model. Probing the fundamental excitations of the dimerized Mott insulator allows the distinction from normal Mott insulating phases. By computing finite lattices with large diameters the influence of the experimental confinement is discussed in detail.