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Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39

Xie, Xin and Van de Graaff, Michael J. and Chapurin, Roman and Frye, Matthew D. and Hutson, Jeremy M. and D’Incao, José P. and Julienne, Paul S. and Ye, Jun and Cornell, Eric A. (2020) 'Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39.', Physical review letters., 125 (24). p. 243401.


We study three-atom inelastic scattering in ultracold 39 K near a Feshbach resonance of intermediate coupling strength. The nonuniversal character of such resonance leads to an abnormally large Efimov absolute length scale and a relatively small effective range r e , allowing the features of the 39 K Efimov spectrum to be better isolated from the short-range physics. Meticulous characterization of and correction for finite-temperature effects ensure high accuracy on the measurements of these features at large-magnitude scattering lengths. For a single Feshbach resonance, we unambiguously locate four distinct features in the Efimov structure. Three of these features form ratios that obey the Efimov universal scaling to within 10%, while the fourth feature, occurring at a value of scattering length closest to r e , instead deviates from the universal value.

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Publisher statement:Reprinted with permission from the American Physical Society: Xie, Xin, Van de Graaff, Michael J., Chapurin, Roman, Frye, Matthew D., Hutson, Jeremy M., D’Incao, José P., Julienne, Paul S., Ye, Jun & Cornell, Eric A. (2020). Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39. Physical Review Letters 125(24): 243401. © (2020) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:19 October 2020
Date deposited:30 September 2021
Date of first online publication:07 December 2020
Date first made open access:30 September 2021

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