Beyond Born-Oppenheimer approximation in ultracold atomic collisions

Tiemann, E.; Gersema, Philipp; Voges, Kai K.; Hartmann, Torsten; Zenesini, Alessandro; Ospelkaus, Silke

doi:10.1103/physrevresearch.2.013366

Cited by 19 publications

(16 citation statements)

References 31 publications

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“…These values are obtained from coupled-channels calculations using the potentials from Refs. [36][37][38][39]. Our results for a0 and a2 are consistent with the values stated in Refs.…”

Section: A Strong S-wave Interactionssupporting

confidence: 93%

Three-body spin mixing in spin-1 Bose-Einstein condensates

Mestrom,

Li,

Colussi

et al. 2021

Preprint

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We study zero-energy collisions between three identical bosons with spin f = 1 interacting via pairwise potentials. We quantify the corresponding three-body scattering hypervolumes, which parametrize the effective three-body interaction strengths in a many-body description of spin-1 Bose-Einstein condensates. Our results demonstrate universal behavior of the scattering hypervolumes for strong s-and p-wave two-body interactions. At weak interactions we find that the real parts of the scattering hypervolumes are predominantly determined by hard-hyperspherelike collisions which we characterize by a simple formula. With this universal result we estimate that spin mixing via three-body collisions starts to dominate over two-body spin mixing at a typical particle density of 10 17 cm −3 for 23 Na and 41 K spinor condensates. This density can be reduced by tuning the two-body interactions to an s-or p-wave dimer resonance or to a point where two-body spin mixing effectively vanishes. Another possibility to observe effects of three-body spin mixing involves the application of weak magnetic fields to cancel out the effective two-body interaction strength in the characteristic timescale describing the spin dynamics.

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“…These values are obtained from coupled-channels calculations using the potentials from Refs. [36][37][38][39]. Our results for a0 and a2 are consistent with the values stated in Refs.…”

Section: A Strong S-wave Interactionssupporting

confidence: 93%

Three-body spin mixing in spin-1 Bose-Einstein condensates

Mestrom,

Li,

Colussi

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…These values are obtained from coupled-channels calculations using the potentials from Refs. [36][37][38][39]. Our results for a 0 and a 2 are consistent with the values stated in Refs.…”

Section: Weak Interactionssupporting

confidence: 93%

Three-body spin mixing in spin-1 Bose-Einstein condensates

Mestrom

Colussi

et al. 2021

Phys. Rev. A

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“…For characterizing the applied magnetic field at the position of the atoms we determine the positions of several known Feshbach resonances with respect to coil current by observing the enhancement of atom losses close to the resonance [35,36]. We find the six resonances expected [27,37] [37].…”

Section: Magnetic Field Controlmentioning

confidence: 99%

Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance

Herbst¹,

Albers²,

Stolzenberg³

et al. 2022

Preprint

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Ultracold potassium is a promising candidate for quantum technological applications as it allows changing intra-atomic interactions via low-field magnetic Feshbach resonances. However, the realization of high-flux sources of Bose-Einstein condensates remains challenging due to the necessity of optical trapping to use a Feshbach resonance. We investigate the production of all-optical 39 K Bose-Einstein condensates under different scattering lengths using a low-field Feshbach resonance near 33 G. By tuning the scattering length in a range between 75 a0 and 300 a0 we demonstrate a trade off between evaporation speed and final atom number and decrease our evaporation time by a factor of 5 while approximately doubling the atomic flux. To this end, we are able to produce fully condensed ensembles with 5 × 10 4 atoms within 850 ms evaporation time at a scattering length of 232 a0 and 1.6 × 10 5 atoms within 4 s at 158 a0, respectively. We analyze the flux scaling with respect to collision rates and describe routes towards high-flux sources of ultra-cold potassium for inertial sensing.

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Beyond Born-Oppenheimer approximation in ultracold atomic collisions

Cited by 19 publications

References 31 publications

Three-body spin mixing in spin-1 Bose-Einstein condensates

Three-body spin mixing in spin-1 Bose-Einstein condensates

Three-body spin mixing in spin-1 Bose-Einstein condensates

Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using a low-field Feshbach resonance

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