Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 6: Cold atoms III - optical lattices (joint session A/Q)

A 6.4: Vortrag

Montag, 5. März 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 Hutson³ — ¹University 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).