Observation of interspecies Feshbach resonances in an ultracold 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi mathvariant="normal">K</mml:mi><mml:mprescripts /><mml:none /><mml:mn>39</mml:mn></mml:mmultiscripts><mml:mo>−</mml:mo><mml:mmultiscripts><mml:mi>Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mn>133</mml:mn></mml:mmultiscripts></mml:mrow></mml:math>
 mixture and refinement of interaction potentials

Gröbner, Michael; Weinmann, Philipp; Kirilov, Emil; Nägerl, Hanns‐Christoph; Julienne, Paul S.; Sueur, C.; Hutson, Jeremy M.

doi:10.1103/physreva.95.022715

Cited by 35 publications

(20 citation statements)

References 73 publications

(149 reference statements)

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“…An important experimental contribution to pin down interaction potentials with highest accuracy constitutes the characterization of Feshbach scattering resonances, i.e. their positions and widths [10][11][12][13]. Moreover, very narrow resonances have even been proposed for ultracold atom-based detection of changes in fundamental constants [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Mott-insulator-aided detection of ultra-narrow Feshbach resonances

et al. 2018

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We report on the detection of extremely narrow Feshbach resonances by employing a Mott-insulating state for cesium atoms in a three-dimensional optical lattice. The Mott insulator protects the atomic ensemble from high background three-body losses in a magnetic field region where a broad Efimov resonance otherwise dominates the atom loss in bulk samples. Our technique reveals three ultra-narrow and previously unobserved Feshbach resonances in this region with widths below ≈ 10 µG, measured via Landau-Zener-type molecule formation and confirmed by theoretical predictions. For comparatively broader resonances we find a lattice-induced substructure in the respective atom-loss feature due to the interplay of tunneling and strong particle interactions. Our results provide a powerful tool to identify and characterize narrow scattering resonances, particularly in systems with complex Feshbach spectra. The observed ultra-narrow Feshbach resonances could be interesting candidates for precision measurements.

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Section: Introductionmentioning

confidence: 99%

Mott-insulator-aided detection of ultra-narrow Feshbach resonances

et al. 2018

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“…The adjustment procedures were similar to those used for K þ Cs in Ref. [37]. The resulting potential curves were combined with the spin-spin dipolar interaction and an estimate of the 2nd order spin-orbit coupling to allow calculations on states with nonzero relative angular momentum.…”

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confidence: 99%

Forming a Single Molecule by Magnetoassociation in an Optical Tweezer

Zhang

Cairncross

et al. 2020

Phys. Rev. Lett.

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We demonstrate the formation of a single NaCs molecule in an optical tweezer by magnetoassociation through an s-wave Feshbach resonance at 864.11(5) G. Starting from single atoms cooled to their motional ground states, we achieve conversion efficiencies of 47(1)%, and measure a molecular lifetime of 4.7(7) ms. By construction, the single molecules are predominantly [77(5)%] in the center-of-mass motional ground state of the tweezer. Furthermore, we produce a single p-wave molecule near 807 G by first preparing one of the atoms with one quantum of motional excitation. Our creation of a single weakly bound molecule in a designated internal state in the motional ground state of an optical tweezer is a crucial step towards coherent control of single molecules in optical tweezer arrays.

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“…[23,24], based on the analysis of the ground and several excited states of the molecule. Experiments with mixed ultracold ensembles of K and Cs were reported in 2014 -2017 [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…In Ref. [27] the repulsive part of the potential curves from [28] was further adjusted in order to reproduce the positions of newly observed Feshbach resonances. Very recently Schwarzer and Toennies [30] reanalyzed the experimental data from [2] using the semi-empirical analytical form of the PEC, which was different from the PEC form used in Refs.…”

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confidence: 99%

The $a^3Σ^+$ state of KCs revisited: hyperfine structure analysis and potential refinement

Krumins,

Tamanis,

Ferber

et al. 2022

Preprint

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Laser-induced fluorescence spectra of the c 3 Σ + (vc, Jc = Nc) → a 3 Σ + (va, Na = Jc ± 1) transitions excited from the ground X 1 Σ + state of 39 K 133 Cs molecule were recorded with Fourier-transform spectrometer IFS125-HR (Bruker) at the highest achievable spectral resolution of 0.0063 cm −1 . Systematic study of the hyperfine structure (HFS) of the a 3 Σ + state for levels with va ∈ [0, 27] and Na ∈ [24, 90] shows that the splitting monotonically increases with va. The spectroscopic study was supported by ab initio calculations of the magnetic hyperfine interaction in X 1 Σ + and a 3 Σ + states. The discovered variation of the electronic matrix elements with the internuclear distance R is in a good agreement with the observed va-dependencies of the HFS. Overall set of available experimental data on the a 3 Σ + state was used to improve the potential energy curve particularly near a bottom, providing the refined dissociation energy De=267.21(1) cm −1 . The ab initio HFS matrix elements, combined with the empirical X 1 Σ + and a 3 Σ + PECs in the framework of the invented coupled-channel deperturbation model, reproduce the experimental term values of both ground states within 0.003 cm −1 accuracy up to their common dissociation limit.

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Observation of interspecies Feshbach resonances in an ultracold K39−Cs133 mixture and refinement of interaction potentials

Cited by 35 publications

References 73 publications

Mott-insulator-aided detection of ultra-narrow Feshbach resonances

Mott-insulator-aided detection of ultra-narrow Feshbach resonances

Forming a Single Molecule by Magnetoassociation in an Optical Tweezer

The $a^3Σ^+$ state of KCs revisited: hyperfine structure analysis and potential refinement

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