Temperature dependence of an Efimov resonance in $^{39}\mathrm{K}$
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 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 .
Keywords
Cite
@article{arxiv.1807.05001,
title = {Temperature dependence of an Efimov resonance in $^{39}\mathrm{K}$},
author = {Lars J. Wacker and Nils B. Jørgensen and Kristoffer T. Skalmstang and Magnus G. Skou and Artem G. Volosniev and Jan J. Arlt},
journal= {arXiv preprint arXiv:1807.05001},
year = {2018}
}