Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.42: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Interacting Bose-Fermi Mixtures in Optical Lattices — •Simon Braun1, Sebastian Will1, Thorsten Best2, Philipp Ronzheimer1, Michael Schreiber1, Tim Rom1, Ulrich Schneider1, Dirk-Sören Lühmann3, and Immanuel Bloch1 — 1Ludwig-Maximilians-Universität München — 2Albert-Ludwigs Universität Freiburg — 3Universität Hamburg
Mixtures of ultracold quantum gases in optical lattices form novel quantum many-body systems, whose properties are governed by an intriguing interplay of quantum statistics, inter- and intraspecies interactions, as well as the relative atom numbers of the constituents.
In our setup, we cool bosonic 87Rb and fermionic 40K to simultaneous quantum degeneracy. We realize a Bose-Fermi Hubbard model by loading the atoms into the combined potential of a blue-detuned three-dimensional optical lattice and a red-detuned dipole trap. Interspecies interactions are controlled using Feshbach resonances and Raman transitions between different Zeeman sublevels.
Our investigations of the many-body properties of an attractively interacting Bose-Fermi mixture revealed a marked shift in the superfluid to Mott insulator transition due to selftrapping. By studying the quantum collapse and revival dynamics of the bosonic component in the 3D optical lattice, we were able to measure the Bose-Bose and Bose-Fermi interaction energies with high precision and revealed a modification of Bose-Bose interactions induced by an interacting fermion.
Finally, we present improvements to the experimental apparatus implemented after relocation to Munich.