Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.34: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Ultracold fermions in honeycomb optical lattices — •Thomas Uehlinger1, Daniel Greif1, Gregor Jotzu1, Leticia Tarruell1,2, and Tilman Esslinger1 — 1Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — 2LP2N UMR 5298, Univ. Bordeaux 1, Institut d’Optique and CNRS, 351 cours de la Libération, 33405 Talence, France
Ultracold Fermi gases have emerged as a versatile tool to simulate condensed matter phenomena. For example, the control of interactions in optical lattices has lead to the observation of Mott insulating phases. However, the topology of the lattice is equally important for the proper- ties of a solid. A prime example is the honeycomb lattice of graphene, where the presence of topological defects in momentum space - the Dirac points - leads to extraordinary transport properties.
We report on the investigation of Dirac points of a quantum degenerate Fermi gas of 40K atoms confined in the honeycomb structure of an optical lattice with tunable topology. The lattice is created by superimposing a square lattice with an interfering superlattice, which can be continuously adjusted to create square, triangular, dimer und honeycomb structures. The band structure is studied in detail using Bloch oscillations, particularly addressing the double passing of the two Dirac points. We also report on the investigation of the effect of interactions when loading a two-component repulsively interacting Fermi gas into the newly accessible lattice geometries.