Dresden 2011 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.34: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

Realization of Tunable Tunneling Dynamics and New Phases in Triangular Optical Lattices — •Christoph Ölschläger, Julian Struck, Christina Staarmann, Parvis Soltan-Panahi, Rodolphe Le Targat, Patrick Windpassinger, and Klaus Sengstock — Institut für Laser-Physik, Universität Hamburg, 22761 Hamburg, Germany

Ultracold quantum gases in optical lattices are well suited to investigate and simulate systems known from other physical branches.

Here we report on the simulation of new non-ferromagnetic phases of spinless bosons in triangular lattices that can be described in analogy to magnetism in solid state physics. The additional degree of freedom in our system is the possibility to change the order and sign of the tunneling matrix elements between adjacent lattice sites. An independent control of the various tunneling parameters is achieved by a fast elliptical lattice acceleration. This is induced by frequency modulations of the lattice beams where the well adjustable modulation amplitudes determine the resulting tunneling dynamics.

First experimental observations and analysis of the different phases in the weakly interacting regime are presented. The excellent agreement between theoretical predictions (Eckardt et al. [1]) and the observed phases is promising to explore the strongly interacting regime and associated new quantum phases like a spin-liquid.

[1] A. Eckardt et al., EPL 89, 10010 (2010)