Stuttgart 2012 – wissenschaftliches Programm
Q 34.49: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.I+II
a K-Rb setup for probing fermions in optical lattices — •Lucia Duca1, Tracy Li1,2, Monika Schleier-Ssmith1,2, Martin Boll2, Martin Reitter1, Jens Phillip Ronzheimer1, Ulrich Schneider1, and Immanuel Bloch1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
In recent years there has been a growing interest in studying the Fermi-Hubbard model using ultracold fermions in optical lattices. Whereas previous experiments have primarily investigated the 3D Fermi-Hubbard model, little is known experimentally about phenomena in single 2D and coupled 2D Fermi-Hubbard systems.
Here we present a double species apparatus for studying Fermions in 2D Hubbard systems. In the experiment, the 40K and 87Rb atoms are laser-cooled using a combination of 2D+ and 3D magneto-optical traps (MOTs). The design for a 2D+MOT is presented, together with the experimental results obtained after optimization of the combined 2D+ and 3D MOTs. In particular, we jointly optimize the K and Rb atom numbers by using a dark spot MOT and by carefully choosing the temperature of the 2D MOT chamber, in order to minimize collisional losses. After the MOTs, the mixture is magnetically transported into a glass cell, where sympathetic and evaporative cooling to quantum degeneracy will occur. Finally, the atoms are loaded into the lattice.
We present the current status of this experimental setup, focusing on our new vacuum setup, magnetic transport design and the 2D lattice configuration.