Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 42: Poster Session IIIb
A 42.10: Poster
Donnerstag, 8. März 2018, 16:15–18:15, Zelt Ost
Tunable spin-exchange interaction in ytterbium-173 — •Oscar Bettermann1,2, Nelson Darkwah Oppong1,2, Luis Riegger1,2, Moritz Höfer1,2, Bloch Immanuel1,2, and Simon Fölling1,2 — 1Max-Planck-Institut für Quantenoptik, Garching — 2Ludwig-Maximilians-Universität, München
Ytterbium as an alkaline-earth-like atom features a metastable excited state, the so-called clock state, that can be directly addressed from the ground state with an ultra-narrow laser. The metastable clock state opens up the possibility of probing interacting two-orbital many-body systems.
Since the ground and clock state have, in general, distinct atomic polarizabilities, the confinement and mobility can be tuned in state-dependent optical lattices. In our implementation, atoms in the clock state are pinned on individual lattice sites whereas ground-state atoms remain mobile. Together with the strong spin-exchanging interaction of ytterbium-173, Kondo-like Hamiltonians can be realized.
We find that the spin-exchange coupling is mediated via super-exchange processes and can be tuned resonantly by varying the confinement. This novel tuning mechanism could potentially be used for studying dynamics of the Kondo and Kondo lattice model with ultracold atoms.