Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.67: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Controlling spin-exchange collisions between individual neutral impurities and an ultracold quantum gas — •Sabrina Burgardt1, Quentin Bouton1, Daniel Adam1, Jens Nettersheim1, Daniel Mayer1, and Artur Widera1,2 — 1Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, Germany — 2Graduate School Materials Science in Mainz, Kaiserslautern, Germany
Individual neutral atoms in an ultracold bath are a paradigmatic model of quantum impurity physics. The microscopic interaction mechanisms can be employed to use them as single-atom quantum probes, mapping information of their environment onto quantum mechanics states[1]. Individual impurities with resonant spin-exchange are the fundamental building block of the (Bose) Kondo effect, forming correlated states of the impurity with its environment.
We report a method to adjust the energy detuning in the spin-exchange dynamics of individual neutral Caesium atoms with total spin F=3 in an ultracold Rubidium gas with total spin F=1. Controlling the AC-Zeeman-Shift, induced by an off-resonant microwave or laser field, enables a selective tuning between inelastic endo- and exoergic spin-exchange collisions between the impurities and the bath. We show parameter regimes that allow tuning spin-exchange processes to resonance. This will furthermore enable future studies of impurity-bath interaction with tuneable dissipation.
[1] Q. Bouton et al., arxiv: 1906.00844, 2019