Ultracold field-linked tetratomic molecules

Xing-Yan Chen, Shrestha Biswas, Sebastian Eppelt, Andreas Schindewolf, Fulin Deng, Tao Shi (), Su Yi, Timon A. Hilker, Immanuel Bloch and Xin-Yu Luo ()
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Xing-Yan Chen: Max-Planck-Institut für Quantenoptik
Shrestha Biswas: Max-Planck-Institut für Quantenoptik
Sebastian Eppelt: Max-Planck-Institut für Quantenoptik
Andreas Schindewolf: Max-Planck-Institut für Quantenoptik
Fulin Deng: Wuhan University
Tao Shi: Chinese Academy of Sciences
Su Yi: Chinese Academy of Sciences
Timon A. Hilker: Max-Planck-Institut für Quantenoptik
Immanuel Bloch: Max-Planck-Institut für Quantenoptik
Xin-Yu Luo: Max-Planck-Institut für Quantenoptik

Nature, 2024, vol. 626, issue 7998, 283-287

Abstract: Abstract Ultracold polyatomic molecules offer opportunities1 in cold chemistry2,3, precision measurements4 and quantum information processing5,6, because of their rich internal structure. However, their increased complexity compared with diatomic molecules presents a challenge in using conventional cooling techniques. Here we demonstrate an approach to create weakly bound ultracold polyatomic molecules by electroassociation7 (F.D. et al., manuscript in preparation) in a degenerate Fermi gas of microwave-dressed polar molecules through a field-linked resonance8–11. Starting from ground-state NaK molecules, we create around 1.1 × 103 weakly bound tetratomic (NaK)2 molecules, with a phase space density of 0.040(3) at a temperature of 134(3) nK, more than 3,000 times colder than previously realized tetratomic molecules12. We observe a maximum tetramer lifetime of 8(2) ms in free space without a notable change in the presence of an optical dipole trap, indicating that these tetramers are collisionally stable. Moreover, we directly image the dissociated tetramers through microwave-field modulation to probe the anisotropy of their wavefunction in momentum space. Our result demonstrates a universal tool for assembling weakly bound ultracold polyatomic molecules from smaller polar molecules, which is a crucial step towards Bose–Einstein condensation of polyatomic molecules and towards a new crossover from a dipolar Bardeen–Cooper–Schrieffer superfluid13–15 to a Bose–Einstein condensation of tetramers. Moreover, the long-lived field-linked state provides an ideal starting point for deterministic optical transfer to deeply bound tetramer states16–18.

Date: 2024
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DOI: 10.1038/s41586-023-06986-6

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