Hannover 2016 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster: Quantum Optics and Photonics II

Q 27.23: Poster

Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof

Time-periodic driving of a spin-dependent honeycomb lattice — •Tobias Klafka, Christoph Ölschläger, Malte Weinberg, Juliette Simonet, and Klaus Sengstock — Institut für Laserphysik, Universität Hamburg

The presence of Dirac points in honeycomb lattice structures such as graphene gives rise to many intriguing phenomena. For bosonic quantum gases in spin-dependent optical lattices these Dirac cones can be opened in a controlled manner by lifting the degeneracy of the diatomic basis. However, the experimentally realized band structure reacts very sensitively to stray magnetic fields.

Here we present an active compensation setup for dc- and ac-magnetic fields attenuated below 1 mG for frequencies up to 1 kHz. Such an improved control over the magnetic field permits new driving schemes and thus the targeted engineering of exotic properties.