High phase-space density gas of NaCs Feshbach molecules
Aden Z. Lam, Niccolò Bigagli, Claire Warner +5 more
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.
arXiv:2202.03355•Physical Review Research•Apr 25, 2022•24 citations