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Inelastic collisions in radiofrequency-dressed mixtures of ultracold atoms.

Bentine, Elliot and Barker, Adam J. and Luksch, Kathrin and Sunami, Shinichi and Harte, Tiffany L. and Yuen, Ben and Foot, Christopher J. and Owens, Daniel J. and Hutson, Jeremy M. (2020) 'Inelastic collisions in radiofrequency-dressed mixtures of ultracold atoms.', Physical review research., 2 (3). 033163.


Radiofrequency (rf) -dressed potentials are a promising technique for manipulating atomic mixtures, but so far little work has been undertaken to understand the collisions of atoms held within these traps. In this paper, we dress a mixture of 85Rb and 87Rb with rf radiation, characterize the inelastic loss that occurs, and demonstrate species-selective manipulations. Our measurements show the loss is caused by two-body 87Rb+85Rb collisions, and we show the inelastic rate coefficient varies with detuning from the rf resonance. We explain our observations using quantum scattering calculations, which give reasonable agreement with the measurements. The calculations consider magnetic fields both perpendicular to the plane of rf polarization and tilted with respect to it. Our findings have important consequences for future experiments that dress mixtures with rf fields.

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Publisher statement:Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Date accepted:29 May 2020
Date deposited:29 October 2020
Date of first online publication:29 July 2020
Date first made open access:29 October 2020

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