A High Phase-Space Density Gas of NaCs Feshbach Molecules

• URL: http://arxiv.org/abs/2202.03355v3
• Date: Thu, 5 May 2022 13:40:57 GMT
• Title: A High Phase-Space Density Gas of NaCs Feshbach Molecules
• Authors: Aden Z. Lam, Niccol\`o Bigagli, Claire Warner, Weijun Yuan, Siwei Zhang, Eberhard Tiemann, Ian Stevenson, Sebastian Will
• Abstract summary: We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5) G.
• Score: 0.923479261181546
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We report on the creation of ultracold gases of bosonic Feshbach molecules of NaCs. The molecules are associated from overlapping gases of Na and Cs using a Feshbach resonance at 864.12(5) G. We characterize the Feshbach resonance using bound state spectroscopy, in conjunction with a coupled-channel calculation. By varying the temperature and atom numbers of the initial atomic mixtures, we demonstrate the association of NaCs gases over a wide dynamic range of molecule numbers and temperatures, reaching 70 nK for our coldest systems and a phase-space density near 0.1. This is an important stepping-stone for the creation of degenerate gases of strongly dipolar NaCs molecules in their absolute ground state.

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