Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 63: Quantum gases: Lattices III
Q 63.5: Vortrag
Freitag, 21. März 2014, 15:00–15:15, UDL HS2002
Precision spectroscopy of ultracold fermions in a triangular optical lattice — •Nick Fläschner1, Dominik Vogel1, Frieder Fröbel1, Jasper Simon Krauser1, Jannes Heinze1, Christof Weitenberg1, Klaus Sengstock1,2, and Christoph Becker1,2 — 1Institut für Laserphysik, Universität Hamburg, Germany — 2Zentrum für Optischen Quantentechnologien, Universität Hamburg, Germany
Ultracold fermions in optical lattices provide an ideal testing ground for solid-state theories due to the high experimental control and wide range of tunable parameters. Probing the elementary excitation spectrum of these systems is of great interest and it is of substantial interest to measure both the band structure and the filling of the lowest bands. In this talk, we present measurements of the full two-dimensional band structure of ultracold fermions in a triangular lattice using a versatile, fully momentum-resolved spectroscopy method based on lattice amplitude modulation. Our newly implemented lattice setup allows us to tune the tunneling matrix elements in each lattice direction independently. In combination with the high precision of the spectroscopy technique, this is promising for engineering and investigating novel lattice systems with interacting fermionic spin-mixtures and non-equilibrium phenomena in exotic lattice geometries including strong artificial gauge fields.