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 57.41: Poster

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

Novel Preparation Schemes for Hexagonal Lattices — •Christina Staarmann, Parvis Soltan-Panahi, Julian Struck, Christoph Ölschläger, Dirk-Sören Lühmann, Rodolphe Le Targat, Patrick Windpassinger, and Klaus Sengstock — Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

We have recently realized a spin-dependent hexagonal lattice, which imposes an intrinsic magnetic ordering on the atoms [1]. In this way, it is possible to uniquely study interaction effects between different spin-states leading to novel quantum phases such as the realization of an interaction induced mixing of the s- and p-band states in the superfluid regime. Another interesting aspect of the hexagonal lattice geometry is its linear – Dirac-particle like – dispersion relation at the vicinity of the so-called Dirac cones which can even be explored in case of an ultracold cloud of bosonic atoms, such as ⁸⁷Rb.

Here, we present a novel experimental preparation scheme, which allows for an in-situ manipulation of the spin-dependent potential. This is achieved by a controlled change of the magnetic quantization axis of the system. In this way it is also possible to continuously tune the band-gap at the Dirac cone, offering an important prerequisite to study Dirac-like physics with ultracold atoms.

[1] Multi-Component Quantum Gases in Spin-Dependent Hexagonal Lattices: P. Soltan-Panahi, J. Struck, P. Hauke, A. Bick, W. Plenkers, G. Meineke, C. Becker, P. Windpassinger, M. Lewenstein, K. Sengstock, Preprint: arXiv:1005.1276 (2010)