Dresden 2011 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 17: Fermi Quantum Gas
Q 17.6: Talk
Tuesday, March 15, 2011, 11:45–12:00, BAR Schön
Double-degenerate Bose-Fermi mixture of strontium — •Simon Stellmer1,2, Meng Khoon Tey1, Mark Parigger1,2, Rudolf Grimm1,2, and Florian Schreck1 — 1Institut für Quantenoptik und Quanteninformation, 6020 Innsbruck, Austria — 2Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
We report on the achievement of a double-degenerate Bose-Fermi mixture of strontium. A sample of fermionic 87Sr atoms is spin-polarized and sympathetically cooled by interisotope collisions with the bosonic isotope 84Sr. At the end of evaporation, 2 × 104 87Sr atoms at a degeneracy of T/TF=0.30(5) co-exist with a BEC of 84Sr. Fermions with two valence electrons have a rich electronic structure, which comprises metastable states, narrow intercombination lines, and a nuclear spin that can be as large as 9/2 in 87Sr. These properties are at the heart of recent proposals for quantum simulation, especially the study of SU(N) magnetism. Loading the fermions into a lattice is the next step towards the realization of such systems. Furthermore, we report on BEC of 86Sr with an unusually large scattering length of ∼ 800 a0.