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arXiv · 1807.05001

Temperature dependence of an Efimov resonance in $^{39}\mathrm{K}$

Lars J. Wacker·Nils B. Jørgensen·Kristoffer T. Skalmstang·Magnus G. Skou·Artem G. Volosniev·Jan J. Arlt
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Abstract

Ultracold atomic gases are an important testing ground for understanding few-body physics. In particular, these systems enable a detailed study of the Efimov effect. We use ultracold $^{39}\mathrm{K}$ to investigate the temperature dependence of an Efimov resonance. The shape and position of the observed resonance are analyzed by employing an empirical fit, and universal finite-temperature zero-range theory. Both procedures suggest that the resonance position shifts towards lower absolute scattering lengths when approaching the zero-temperature limit. We extrapolate this shift to obtain an estimate of the three-body parameter at zero temperature. A surprising finding of our study is that the resonance becomes less prominent at lower temperatures, which currently lacks a theoretical description and implies physical effects beyond available models. Finally, we present measurements performed near the Feshbach resonance center and discuss the prospects for observing the second Efimov resonance in $^{39}\mathrm{K}$.

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Lars J. Wacker, Nils B. Jørgensen, Kristoffer T. Skalmstang, Magnus G. Skou, Artem G. Volosniev, Jan J. Arlt. 2018-11-27. Temperature dependence of an Efimov resonance in $^{39}\mathrm{K}$. https://doi.org/10.1103/physreva.98.052706

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