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Q: Fachverband Quantenoptik und Photonik

Q 17: Fermi Quantum Gas

Q 17.6: Vortrag

Dienstag, 15. März 2011, 11:45–12:00, BAR Schön

Double-degenerate Bose-Fermi mixture of strontium — •Simon Stellmer^1,2, Meng Khoon Tey¹, Mark Parigger^1,2, Rudolf Grimm^1,2, 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 × 10^{4 87}Sr atoms at a degeneracy of T/T_F=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.