Controlling the formation of cold molecules via a Feshbach resonance

Tolra, B. Laburthe; Hoang, Nathalie; T’Jampens, B.; Vanhaecke, Nicolas; Drag, Cyril; Crubellier, A.; Comparat, D.; Pillet, P.

doi:10.1209/epl/i2003-00284-x

Cited by 30 publications

(21 citation statements)

References 24 publications

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“…One of the first experiments with Feshbachresonant scattering lengths in 85 Rb used a photoassociation laser as a probe [33], thereby observing enhancement of the conversion from atoms to molecules, and later experiments in 133 Cs observed supression [34]. Supression and enhancement were then observed together in 133 Cs [35], an investigation that also included a successful numerical model based on photoassociation with a Feshbach-tunable scattering length. Most recently, the Feshbach resonance was observed to vary the photoassociation rate constant by over four decades, and to anomalously shift the position of laser resonance to the blue end of the photoassociation spectrum for near-resonant magnetic fields [36,37].…”

Section: Introductionmentioning

confidence: 99%

Theory of combined photoassociation and Feshbach resonances in a Bose-Einstein condensate

Mackie

DeBrosse

2010

Phys. Rev. A

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We model combined photoassociation and Feshbach resonances in a Bose-Einstein condensate, where the shared dissociation continuum allows for quantum interference in losses from the condensate, as well as a dispersive-like shift of resonance. A seemingly oversimplified model is revisited, explaining it as based on the limit of weakly bound molecules, reinforcing it with a comparison to numerical experiments that explicitly include dissociation to noncondensate modes, comparing it against the unitarity limit on condensate losses, and lastly, checking its universal implications. In particular, for a resonant laser and an off-resonant magnetic field, these numerical experiments reveal a rate limit on condensate losses that is larger for smaller condensate densities, approaches the rate limit for magnetoassociation alone near the Feshbach resonance, and agrees best with the analytical model for low density. Comparing the analytical rate limit against the unitary limit, which is set by the size of the condensate, agreement is found only for a limited range of near-resonant magnetic fields. Finally, for a resonant magnetic field and an off-resonant laser, the analytical shift of the Feshbach resonance is found to depend on the size of the Feshbach molecule, signifying nonuniversal physics in a strongly interacting system.

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Section: Introductionmentioning

confidence: 99%

Theory of combined photoassociation and Feshbach resonances in a Bose-Einstein condensate

Mackie

DeBrosse

2010

Phys. Rev. A

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“…2. This effect is well understood in the context of Feshbach-Optimized Photoassociation (FOPA) [67][68][69] and is due to the modification of the scattering wavefunction in the vicinity of a Feshbach resonance which, in turn, modifies the Franck-Condon overlap with a specific excited vibrational level. The effect is typically used to enhance the PA rate of a transition.…”

Section: Methodsmentioning

confidence: 99%

Production of ultracold Cs*Yb molecules by photoassociation

et al. 2018

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“…al. [33,34] and verified by many groups later on [35]- [39]. In terms of these studies, if a Feshbach quasi-bound state is adjusted close to the continuum, the atomic scattering wavefunction, acquiring some bound-state properties, becomes more localized.…”

Section: Introductionmentioning

confidence: 92%

Efficient production of polar molecular Bose–Einstein condensates via an all-optical R-type atom–molecule adiabatic passage

Qian¹,

Zhou²,

Zhang³

et al. 2010

New J. Phys.

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We propose a scheme of "R-type" photoassociative adiabatic passage (PAP) to create polar molecular condensates from two different species of ultracold atoms. Due to the presence of a quasi-coherent population trapping state in the scheme, it is possible to associate atoms into molecules with a low-power photoassociation (PA) laser. One remarkable advantage of our scheme is that a tunable atom-molecule coupling strength can be achieved by using a time-dependent PA field, which exhibits larger flexibility than using a tunable magnetic field. In addition, our results show that the PA intensity required in the "R-type" PAP could be greatly reduced compared to that in a conventional "Λ-type" one.

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Controlling the formation of cold molecules via a Feshbach resonance

Cited by 30 publications

References 24 publications

Theory of combined photoassociation and Feshbach resonances in a Bose-Einstein condensate

Theory of combined photoassociation and Feshbach resonances in a Bose-Einstein condensate

Production of ultracold Cs*Yb molecules by photoassociation

Efficient production of polar molecular Bose–Einstein condensates via an all-optical R-type atom–molecule adiabatic passage

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