Symmetry Breaking in Sticky Collisions between Ultracold Molecules

Man, Marijn P.; Groenenboom, Gerrit C.; Karman, Tijs

doi:10.1103/physrevlett.129.243401

Cited by 7 publications

(12 citation statements)

References 81 publications

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“…Other loss processes, such as three-body collisions, nonexcited complexes falling out of the trap, spontaneous decay into stable four-atom states, or excitation by blackbody radiation, seem to be orders of magnitude too slow compared to τ RRKM . , Therefore, trapping ground-state molecules in the absence of intense laser light should lead to a suppression of the loss.…”

Section: Established Theory Frameworkmentioning

confidence: 99%

“…In ref , it was shown that an external electric field can also affect the long-range part of the collision, since it brings the molecules into a superposition of multiple angular-momentum states, leading to increased density of states. However, this effect is weaker than the short-range effect predicted in ref , and it requires 1 to 2 orders of magnitude higher field strengths to become important.…”

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

“…To estimate at which strength the hyperfine couplings will start to play a role, one can compare the inverse of the coupling strength to τ RRKM . The strongest effect is the coupling of the dynamically changing electric-field gradient to the nuclear quadrupole moments. , Using the couplings of the free molecules, Man et al estimated that nuclear-spin flips are unlikely to happen. However, Jachymski et al showed that the couplings are strongly geometry dependent, and therefore, nuclear-spin-changing collisions can not be ruled out.…”

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

“…In recent work by Man et al, 58 the statistical assumption for atom–diatom and diatom–diatom collisions was tested with classical trajectory simulations and found to be valid. In order to extract the sticking times from classical trajectory simulations, it is important to set appropriate long-range boundary conditions because the classical approximation is no longer justified if the molecules move far away from each other.…”

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

“…Using classical trajectory simulations, Man et al 58 estimated that electric fields on the order of 10 V/cm are already sufficient to break angular-momentum conservation. Indeed, these are the field strengths where the typical molecular Stark couplings are comparable to the level spacing of the complex.…”

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

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Ultracold Sticky Collisions: Theoretical and Experimental Status

et al. 2023

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Collisional complexes, which are formed as intermediate states in molecular collisions, are typically short-lived and decay within picoseconds. However, in ultracold collisions involving bialkali molecules, complexes can live for milliseconds, completely changing the collision dynamics. This can lead to unexpected two-body loss in samples of nonreactive molecules. During the past decade, such "sticky" collisions have been a major hindrance in the preparation of dense and stable molecular samples, especially in the quantum-degenerate regime. Currently, the behavior of the complexes is not fully understood. For example, in some cases, their lifetime has been measured to be many orders of magnitude longer than recent models predict. This is not only an intriguing problem in itself but also practically relevant, since understanding molecular complexes may help to mitigate their detrimental effects. Here, we review the recent experimental and theoretical progress in this field. We treat the case of molecule−molecule as well as molecule−atom collisions.

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Section: Established Theory Frameworkmentioning

confidence: 99%

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

Section: Proposals Beyond the Established Theorymentioning

confidence: 99%

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Ultracold Sticky Collisions: Theoretical and Experimental Status

et al. 2023

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Resonances in Non-universal Dipolar Collisions

Karman¹

2023

J. Phys. Chem. A

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Scattering resonances due to the dipole−dipole interaction between ultracold molecules, induced by static or microwave fields, are studied theoretically. We develop a method for coupled-channel calculations that can efficiently impose many short-range boundary conditions, defined by a short-range phase shift and loss probability as in quantum defect theory. We study how resonances appear as the short-range loss probability is lowered below the universal unit probability. This may become realizable for nonreactive ultracold molecules in blue-detuned box potentials.

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Coherent Control of Ultracold Molecular Collisions: The Role of Resonances

Devolder

Tscherbul

Brumer

2023

J. Phys. Chem. Lett.

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We consider the coherent control of ultracold molecule−molecule scattering, impacted by a dense set of rovibrational resonances. To characterize the resonance spectrum, a rudimentary model based on multichannel quantum defect theory has been used to study the control of the scattering cross section and the reaction rate. Complete control around resonance energies is shown to be possible, but thermal averaging over a large number of resonances significantly reduces the extent of control of reaction rates related to the random distribution of optimal control parameters between resonances. We show that measuring the extent of coherent control could be used to extract meaningful information about the relative contribution of direct scattering versus collision complex formation, as well as about the statistical regime.

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Symmetry Breaking in Sticky Collisions between Ultracold Molecules

Cited by 7 publications

References 81 publications

Ultracold Sticky Collisions: Theoretical and Experimental Status

Ultracold Sticky Collisions: Theoretical and Experimental Status

Resonances in Non-universal Dipolar Collisions

Coherent Control of Ultracold Molecular Collisions: The Role of Resonances

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