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Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Cold atoms III - optical lattices (joint session A/Q)

Q 11.4: Talk

Monday, March 5, 2018, 14:45–15:00, K 0.011

Observation of Feshbach resonances between alkali and closed-shell atoms — •Vincent Barbé1, Alessio Ciamei1, Lukas Reichsöllner1, Benjamin Pasquiou1, Florian Schreck1, Piotr Zuchowski2, and Jeremy Hutson31University of Amsterdam, The Netherlands — 2Nicolaus Copernicus University, Poland — 3Durham University, United Kingdom

Magnetic Feshbach resonances are widely used to tune interactions of ultracold atoms or to magneto-associate pairs of atoms into diatomic molecules. Such resonances have been observed and used extensively for pairs of open-shell atoms, but were never detected for pairs of alkali and closed-shell atoms. Here we demonstrate experimentally the existence of such resonances in mixtures of 87Sr or 88Sr with 87Rb [1]. Two of the coupling mechanisms involved in these Feshbach resonances were theoretically investigated in previous works [2], and in addition we discover a new form of anisotropic coupling between rotating molecular states and s-wave scattering states. This opens a route towards the magneto-association of Rb and Sr into open-shell, strongly polar molecules in an optical lattice.

[1] V. Barbé et al., arXiv:1710.03093 (2017).

[2] P. Żuchowski et al., Phys. Rev. Lett. 105, 153201 (2010).

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