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Investigation of Feshbach Resonances in ultra-cold 40K spin mixtures



Eite Tiesinga, J Krauser, J Heinze, S Gotze, M Lanbecker, N Flashner, L Cook, T Hanna, K Sengstock, C Becker


Magnetically-tunable Feshbach resonances are an indispensable tool for experiments with atomic quantum gases. We report on twenty thus far unpublishedi Feshbach resonances and eleven further probable Feshbach resonances in spin mixtures of ultracold fermionic 40K with temperatures well below 100 nK. In particular, we locate a broad resonance at B = 389.6 G with a magnetic width of 26.4 G. Here 1 G = 10-4 T. Furthermore, by exciting low-energy spin waves, we demonstrate a novel means to precisely determine the zero crossing of the scattering length for this broad Feshbach resonance. Our findings allow for further tunability in experiments with ultracold 40K quantum gases.
Physical Review A


ultracold atoms, collisional resonances


Tiesinga, E. , Krauser, J. , Heinze, J. , Gotze, S. , Lanbecker, M. , Flashner, N. , Cook, L. , Hanna, T. , Sengstock, K. and Becker, C. (2017), Investigation of Feshbach Resonances in ultra-cold 40K spin mixtures, Physical Review A, [online], (Accessed July 17, 2024)


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Created April 3, 2017, Updated November 10, 2018