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Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39

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.

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Authors

Xin Xie

Michael J. Van de Graaff

Roman Chapurin

José P. D’Incao

Paul S. Julienne

Jun Ye

Eric A. Cornell



Abstract

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.

Citation

Xie, X., Van de Graaff, M. J., Chapurin, R., Frye, M. D., Hutson, J. M., D’Incao, J. P., …Cornell, E. A. (2020). Observation of Efimov Universality across a Nonuniversal Feshbach Resonance in K39. Physical Review Letters, 125(24), Article 243401. https://doi.org/10.1103/physrevlett.125.243401

Journal Article Type Article
Acceptance Date Oct 19, 2020
Online Publication Date Dec 7, 2020
Publication Date Dec 11, 2020
Deposit Date Dec 9, 2020
Publicly Available Date Mar 29, 2024
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 125
Issue 24
Article Number 243401
DOI https://doi.org/10.1103/physrevlett.125.243401

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Copyright 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.




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