Observation of magnetically tunable Feshbach resonances in ultracold ${}^{23}$Na${}^{40}$K+${}^{40}$K collisions

Abstract

Resonances in ultracold collisions involving heavy molecules are difficult to understand, and have proven challenging to detect. Here we report the observation of magnetically tunable Feshbach resonances in ultracold collisions between ${}^{23}$Na${}^{40}$K molecules in the rovibrational ground state and ${}^{40}$K atoms. We prepare the atoms and molecules in various hyperfine levels of their ground states and observe the loss of molecules as a function of the magnetic field. The atom-molecule Feshbach resonances are identified by observing an enhancement of the loss rate coefficients. We have observed three resonances at approximately 101 G in various atom-molecule scattering channels, with the widths being a few hundred milliGauss. The observed atom-molecule Feshbach resonances at ultralow temperatures probe the three-body potential energy surface with an unprecedented resolution. Our work will help to improve the understanding of complicated ultracold collisions, and open up the possibility of creating ultracold triatomic molecules.

7 pages, 5 figures

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• Dipolar evaporation of reactive molecules to below the Fermi temperature
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• Bimolecular chemistry in the ultracold regime
• Observation of Feshbach resonances between a single ion and ultracold atoms
• Precision test of statistical dynamics with state-to-state ultracold chemistry
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• Ultracold Sticky Collisions: Theoretical and Experimental Status
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• Determining the nature of quantum resonances by probing elastic and reactive scattering in cold collisions
• Resonant dipolar collisions of ultracold molecules induced by microwave dressing
• Evidence for association of triatomic molecule in ultracold ${}^{23}$Na${}^{40}$K and ${}^{40}$K mixture
• Tomography of Feshbach Resonance States
• Magnetic Feshbach resonances in collisions of ${}^{23}$Na${}^{40}$K with ${}^{40}$K
• Observation of interference between resonant and detuned STIRAP in the adiabatic creation of ${}^{23}$Na${}^{40}$K molecules
• Tune-out and magic wavelengths for ground-state ${}^{23}$Na${}^{40}$K molecules
• Unified model of ultracold molecular collisions
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• Complete quantum coherent control of ultracold molecular collisions
• Thermalization and Sub-Poissonian Density Fluctuations in a Degenerate Molecular Fermi Gas
• Ab initio properties of the NaLi molecule in the $a^3{\Sigma }^{+}$ electronic state
• Controlling the ac Stark effect of RbCs with dc electric and magnetic fields
• Quantum spin state selectivity and magnetic tuning of ultracold chemical reactions of triplet alkali-metal dimers with alkali-metal atoms
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• Steering ultracold reactions through long-lived transient intermediates
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• Quantum Many-Body Physics with Ultracold Polar Molecules: Nanostructured Potential Barriers and Interactions
• Molecular Collisions: from Near-cold to Ultra-cold
• Stability of a Bose condensed mixture on a bubble trap
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• Probing ultracold chemistry using ion spectrometry
• Spectrum of Feshbach resonances in NaLi $+$ Na collisions
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• Chemistry of a light impurity in a Bose-Einstein condensate
• Observation of photoassociation resonances in ultracold atom-molecule collisions
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• Ab initio calculation of the spectrum of Feshbach resonances in NaLi + Na collisions
• Magnetic tuning of ultracold barrierless chemical reactions
• Formation of ultracold weakly bound dimers of bosonic ${}^{23}{\text{Na}}^{39}\text{K}$
• Signatures of Non-universal Quantum Dynamics of Ultracold Chemical Reactions of Polar Alkali-dimer Molecules with Alkali-metal Atoms: Li(${}^2$S) +NaLi($a^3{\Sigma }^{+}$) $\to$ Na(${}^2$S) + Li${}_2$($a^3{\Sigma }_u^{+}$)
• Enhanced quantum state transfer via feedforward cancellation of optical phase noise
• Efimov scenario for overlapping narrow Feshbach resonances
• A general approach to state-dependent optical tweezer traps for polar molecules
• Hyperfine dependent atom-molecule loss analyzed by the analytic solution of few-body loss equations
• State-to-state endothermic and nearly thermoneutral reactions in an ultracold atom-dimer mixture
• Symmetry breaking in sticky collisions between ultracold molecules
• Cold atom-dimer reaction rates with ${}^4$He, ${}^{6,7}$Li and ${}^{23}$Na
• Interaction potential for NaCs for ultracold scattering and spectroscopy
• Magnetic Feshbach resonances in ultracold atom-molecule collisions
• Quantum control of ion-atom collisions beyond the ultracold regime
• Feshbach Spectroscopy of Cs Atom Pairs in Optical Tweezers
• Spin hierarchy in van der Waals molecule formation via ultracold three-body recombination
• A Model for Scattering with Proliferating Resonances: Many Coupled Square Wells
• Dynamical excitation processes and correlations of three-body two-dimensional mixtures
• The iSWAP gate with polar molecules: Robustness criteria for entangling operations
• Resonances in non-universal dipolar collisions
• Ultracold molecular collisions in magnetic fields: Efficient incorporation of hyperfine structure in the total rotational angular momentum representation
• Ultracold Interactions between Ions and Polar Molecules
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• Multichannel quantum defect theory with a frame transformation for ultracold atom-molecule collisions in magnetic fields
• Floquet-Engineering of Feshbach Resonances in Ultracold Gases
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• Three-Body Bound States of Quantum Particles: Higher Stability Through Braiding
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• Empirical LiK excited state potentials: connecting short range and near dissociation expansions
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