Characterizing quasibound states and scattering resonances

Frye, Matthew D.; Hutson, Jeremy M.

doi:10.1103/physrevresearch.2.013291

Cited by 9 publications

(6 citation statements)

References 30 publications

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“…For the case of λ scl = 1.0012, the state crosses threshold and causes a zero-energy Feshbach resonance near B = 13 G. At fields just below this, there are clear Breit-Wigner signatures in the calculated eigenphase sum below threshold. We have characterized these as described in the Supplemental Material [43] between 9 and 10 G, using the method of Frye and Hutson [44]. We obtain an energy gradient μ ≈ −0.5 MHz/G and energy widths close to threshold, inel E ≈ 0.06 MHz.…”

Section: Resonances At Rb( 2 S) + Yb( 3 P 2 ) Thresholdsmentioning

confidence: 99%

Feshbach resonances and molecule formation in ultracold mixtures of Rb andYb(P3)atoms

2022

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We have investigated magnetically tunable Feshbach resonances in ultracold collisions of Rb with Yb in its metastable 3 P 2 and 3 P 0 states, using coupled-channel scattering and bound-state calculations. For the 3 P 2 state, we find sharp resonances when both atoms are in their lowest Zeeman sublevels. However, these resonances are decayed by inelastic processes that produce Yb atoms in 3 P 1 and 3 P 0 states. The molecules that might be produced by magnetoassociation at the 3 P 2 thresholds can decay by similar pathways and would have lifetimes no more than a few microseconds. For the 3 P 0 state, by contrast, there are resonances that are promising for magnetoassociation. There are resonances due to both rotating and nonrotating molecular states that are significantly stronger than the analogous resonances for Yb( 1 S). The ones due to rotating states are denser in magnetic field; in contrast to Yb( 1 S), they exist even for bosonic isotopes of Yb( 3 P 0 ).

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Section: Resonances At Rb( 2 S) + Yb( 3 P 2 ) Thresholdsmentioning

confidence: 99%

Feshbach resonances and molecule formation in ultracold mixtures of Rb andYb(P3)atoms

2022

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“…IV), 1 4 |1 − S bb,bb | 2 = sin 2 δ bb . Just above threshold, the M L = 0 bound state and the two degenerate M L = ±1 states emerge as quasi-bound levels that act as isolated normal p-wave resonances with well-defined positions and widths, which we calculate using the algorithm in the molscat package [69,70,79].…”

Section: B Near-threshold Molecular Physicsmentioning

confidence: 99%

Probing open- and closed-channel p-wave resonances

Ahmed-Braun,

Jackson,

Smale

et al. 2021

Preprint

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We study the near-threshold molecular and collisional physics of a strong 40 K p-wave Feshbach resonance through a combination of measurements, numerical calculations, and modeling. Dimer spectroscopy employs both radio-frequency spin-flip association in the MHz band and resonant association in the kHz band. Systematic uncertainty in the measured binding energy is reduced by a model that includes both inhomogeneous broadening and the Franck-Condon overlap amplitude. Coupled-channels calculations based on mass-scaled 39 K potentials compare well to the observed binding energies and also reveal a low-energy p-wave shape resonance in the open channel. Contrary to conventional expectation, we observe a nonlinear variation of the binding energy with magnetic field, and explain how this arises from strong coupling to the open channel. We develop an analytic two-channel model that includes both resonances as well as the dipole-dipole interactions which, we show, become important at low energy. Using this parameterization of the energy dependence of the scattering phase, we can classify the studied 40 K resonance as "broad". Throughout the paper, we compare to the well understood s-wave case, and discuss the significant role played by van der Waals physics. The resulting understanding of the dimer physics of strong p-wave resonances provides a solid foundation for future exploration of few-and many-body orbital physics.

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“…We characterize all the Feshbach resonances that exist below 500 G for each interaction potential, using the method of Frye and Hutson [79,80]. There are typically 50 resonances for each potential, and we obtain values of B res , Δ, and a bg for each resonance.…”

Section: Feshbach Resonances and Bound Statesmentioning

confidence: 99%

Prospects of Forming High-Spin Polar Molecules from Ultracold Atoms

2020

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We investigate Feshbach resonances in collisions of high-spin atoms such as Er and Dy with closed-shell atoms such as Sr and Yb, using coupled-channel scattering and bound-state calculations. We consider both low-anisotropy and high-anisotropy limits. In both regimes, we find many resonances with a wide variety of widths. The wider resonances are suitable for tuning interatomic interactions, while some of the narrower resonances are highly suitable for magnetoassociation to form high-spin molecules. These molecules might be transferred to short-range states, where they would have large magnetic moments and electric dipole moments that can be induced with very low electric fields. The results offer the opportunity to study mixed quantum gases where one species is dipolar and the other is not and open up important prospects for a new field of ultracold high-spin polar molecules.

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Characterizing quasibound states and scattering resonances

Cited by 9 publications

References 30 publications

Feshbach resonances and molecule formation in ultracold mixtures of Rb andYb(P3)atoms

Feshbach resonances and molecule formation in ultracold mixtures of Rb andYb(P3)atoms

Probing open- and closed-channel p-wave resonances

Prospects of Forming High-Spin Polar Molecules from Ultracold Atoms

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