Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 17: Kalte Atome: Fallen und Kühlung
Q 17.8: Vortrag
Montag, 12. März 2012, 18:15–18:30, V7.02
Realization of a two-species 40K and 87Rb 2D+MOT — •Tracy Li1,2, Lucia Duca1, Monika Schleier-Smith1,2, Martin Boll2, Martin Reitter1, Jens Philipp Ronzheimer1, Ulrich Schneider1, and Immanuel Bloch1,2 — 1Fakultät für Physik, Ludwig-Maximilians-Universität, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
Confining quantum degenerate fermions in an optical lattice realizes a highly tunable system for simulating condensed matter phenomena that are difficult to probe in real solids. The evaporative cooling process used to produce quantum degenerate fermions is facilitated by capturing a large number of atoms in the preceding magneto-optical trap (MOT). Optimizing the evaporative cooling process is essential to reaching the low entropies needed to approach, for example, antiferromagnetically ordered states in the fermionic Hubbard model. To this end, we have realized a two-species 2D+MOT and two-species 3D-MOT for fermionic 40K and bosonic 87Rb in our experiment [1, 2]. The 2D+MOT is a pre-cooling stage and generates a collimated, continuous beam of atoms for more efficient loading into the two-species 3D-MOT. We present the implementation and characterization of the two-species 2D+MOT. We observe collisional losses in the two-species 3D-MOT and ameliorate these losses using a dark SPOT MOT for 40K. With this setup, we achieve atom numbers of 1x108 40K and 7x1010 87Rb in the two-species 3D-MOT.
[1] Dieckmann et.al., PRA 58, 3891 (1998).
[2] Ridinger et.al., Eur. Phys. J. D 65, 223-242 (2011).