Feshbach spectroscopy and dual-species Bose-Einstein condensation of Na23−K39 mixtures
| Autor: | Torsten Hartmann, Torben A. Schulze, Silke Ospelkaus, Alessandro Zenesini, Eberhard Tiemann, M. W. Gempel, Kai K. Voges |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Physical Review A. 97 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.97.023623 |
| Popis: | We present measurements of interspecies Feshbach resonances and subsequent creation of dual-species Bose-Einstein condensates of $^{23}\mathrm{Na}$ and $^{39}\mathrm{K}$. We prepare both optically trapped ensembles in the spin state $\left|f=1,{m}_{f}=\ensuremath{-}1\right\ensuremath{\rangle}$ and perform atom loss spectroscopy in a magnetic field range from $0$ to $700\phantom{\rule{0.16em}{0ex}}\mathrm{G}$. The observed features include several $s$-wave poles and a zero crossing of the interspecies scattering length as well as inelastic two-body contributions in the $\mathcal{M}={m}_{\mathrm{Na}}+{m}_{\mathrm{K}}=\ensuremath{-}2$ submanifold. We identify and discuss the suitability of different magnetic field regions for the purposes of sympathetic cooling of $^{39}\mathrm{K}$ and achieving dual-species degeneracy. Two condensates are created simultaneously by evaporation at a magnetic field of about $150\phantom{\rule{0.16em}{0ex}}\mathrm{G}$, which provides sizable intra- and interspecies scattering rates needed for fast thermalization. The impact of the differential gravitational sag on the miscibility criterion for the mixture is discussed. Our results serve as a promising starting point for the magnetoassociation into quantum degenerate $^{23}\mathrm{Na}^{39}\mathrm{K}$ Feshbach molecules. |
| Databáze: | OpenAIRE |
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