Field-linked resonances of polar molecules

Xing-Yan Chen, Andreas Schindewolf, Sebastian Eppelt, Roman Bause, Marcel Duda, Shrestha Biswas, Tijs Karman, Timon Hilker, Immanuel Bloch and Xin-Yu Luo ()
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Xing-Yan Chen: Max-Planck-Institut für Quantenoptik
Andreas Schindewolf: Max-Planck-Institut für Quantenoptik
Sebastian Eppelt: Max-Planck-Institut für Quantenoptik
Roman Bause: Max-Planck-Institut für Quantenoptik
Marcel Duda: Max-Planck-Institut für Quantenoptik
Shrestha Biswas: Max-Planck-Institut für Quantenoptik
Tijs Karman: Radboud University
Timon Hilker: Max-Planck-Institut für Quantenoptik
Immanuel Bloch: Max-Planck-Institut für Quantenoptik
Xin-Yu Luo: Max-Planck-Institut für Quantenoptik

Nature, 2023, vol. 614, issue 7946, 59-63

Abstract: Abstract Scattering resonances are an essential tool for controlling the interactions of ultracold atoms and molecules. However, conventional Feshbach scattering resonances1, which have been extensively studied in various platforms1–7, are not expected to exist in most ultracold polar molecules because of the fast loss that occurs when two molecules approach at a close distance8–10. Here we demonstrate a new type of scattering resonance that is universal for a wide range of polar molecules. The so-called field-linked resonances11–14 occur in the scattering of microwave-dressed molecules because of stable macroscopic tetramer states in the intermolecular potential. We identify two resonances between ultracold ground-state sodium–potassium molecules and use the microwave frequencies and polarizations to tune the inelastic collision rate by three orders of magnitude, from the unitary limit to well below the universal regime. The field-linked resonance provides a tuning knob to independently control the elastic contact interaction and the dipole–dipole interaction, which we observe as a modification in the thermalization rate. Our result provides a general strategy for resonant scattering between ultracold polar molecules, which paves the way for realizing dipolar superfluids15 and molecular supersolids16, as well as assembling ultracold polyatomic molecules.

Date: 2023
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DOI: 10.1038/s41586-022-05651-8

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