Radiofrequency-induced heating of an interacting Bose-Fermi mixture and towards a quantum gas microscope of NaK dipolar molecules*

Radiofrequency spectroscopy of an ultracold, strongly interacting mixture of 23Na and 40K atoms reveals a novel type of halo trimer which consists of two light bosons and one heavy fermion [1]. The trimers have a structure of a Feshbach dimer with a weakly-bound boson and are detected as an additional loss feature near the dimer resonance. In this work, we report on complimentary RF spectra in which the temperature of the mixture following the RF-induced loss process is measured. The spectra reveal striking heating effects at the dimer, trimer, and atomic resonances, which along with trap dynamics and saturation effects explain the discrepancies between observed loss spectra and theoretical lineshapes. With markedly higher SNR than its atom-loss counterpart due to insensitivity to atom number fluctuations, RF heating spectroscopy is an attractive tool for future precision spectroscopy experiments. Additionally, we report on our recent progress towards building a quantum gas microscope of dipolar ground state NaK molecules. 

[1]  A. Chuang, H. Bui, A. Christianen, Y. Zhang, Y. Ni, D. Ahmed-Braun, C. Robens, M. Zwierlein. arXiv:2411.04820. Submitted to PRX.


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<td class="tablecell arxivid" style="padding: 0px 6.5px 0px 0px; vertical-align: top; margin-top: 0px; margin-bottom: 0px; border: 0px; font-size: 0.95em !important;">arXiv:2411.04820