Production of large ${}^{41}$K Bose-Einstein condensates using D1 gray molasses

Abstract

We use D1 gray molasses to achieve Bose-Einstein condensation of a large number of ${}^{41}$K atoms in an optical dipole trap. By combining a new configuration of compressed-MOT with D1 gray molasses, we obtain a cold sample of $2.4\times 10^9$ atoms with a temperature as low as 42 $\mu$K. After magnetically transferring the atoms into the final glass cell, we perform a two-stage evaporative cooling. A condensate with up to $1.2\times 10^6$ atoms in the lowest Zeeman state $|F=1,m_F=1⟩$ is achieved in the optical dipole trap. Furthermore, we observe two narrow Feshbach resonances in the lowest hyperfine channel, which are in good agreement with theoretical predictions.

6 pages, 5 figures

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Cited by in corpus (5)

• Coupled Dipole Oscillations of a Mass-Imbalanced Bose and Fermi Superfluid Mixture
• A compact experimental machine for studying tunable Bose-Bose superfluid mixtures
• Narrow-linewidth cooling of ${}^6$Li atoms using the 2S-3P transition
• Feshbach spectroscopy of an ultracold ${}^{41}$K-${}^6$Li mixture and ${}^{41}$K atoms
• Cooling All External Degrees of Freedom of Optically Trapped Chromium Atoms Using Gray Molasses