Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Quantum gases: Lattices II
Q 57.1: Talk
Friday, March 21, 2014, 10:30–10:45, UDL HS2002
Artificial graphene with tunable interactions — •Michael Messer1, Thomas Uehlinger1, Gregor Jotzu1, Daniel Greif1, Remi Desbuquois1, Walter Hofstetter2, Ulf Bissbort2,3, and Tilman Esslinger1 — 1Institute for quantum electronics, ETH Zurich, Zurich, Switzerland — 2Institut für Theoretische Physik, Goethe Universität Frankfurt, Frankfurt, Germany — 3Singapore university of technology and design, Singapore
We create an artificial graphene system with tunable interactions and study the crossover from metallic to Mott insulating regimes, both in isolated and coupled two-dimensional honeycomb layers. The artificial graphene consists of a two-component spin mixture of an ultracold atomic Fermi gas loaded into a honeycomb optical lattice. For strong repulsive interactions we observe a suppression of double occupancy and measure a gapped excitation spectrum. We present a quantitative comparison between our measurements and theory, making use of a novel numerical method to obtain Wannier functions for complex lattice structures. Extending our studies to time-resolved measurements, we investigate the equilibration of the double occupancy as a function of lattice loading time.