Rapid generation of alloptical ^{39}K BoseEinstein condensates using a lowfield Feshbach resonance
Abstract
Ultracold potassium is an interesting candidate for quantum technology applications and fundamental research as it allows controlling intraatomic interactions via lowfield magnetic Feshbach resonances. However, the realization of highflux sources of BoseEinstein condensates remains challenging due to the necessity of optical trapping to use magnetic fields as free parameters. We investigate the production of alloptical ^{39}K BoseEinstein condensates with different scattering lengths using a Feshbach resonance near 33 G. By tuning the scattering length in a range between 75 a_{0} and 300 a_{0} we demonstrate a tradeoff between evaporation speed and final atom number and decrease our evaporation time by a factor of 5 while approximately doubling the evaporation flux. To this end, we are able to produce fully condensed ensembles with 5.8 ×10^{4} atoms within 850 ms evaporation time at a scattering length of 232 a_{0} and 1.6 ×10^{5} atoms within 3.9 s at 158 a_{0} , respectively. We deploy a numerical model to analyze the flux and atom number scaling with respect to scattering length, identify current limitations, and simulate the optimal performance of our setup. Based on our findings we describe routes towards highflux sources of ultracold potassium for inertial sensing.
 Publication:

Physical Review A
 Pub Date:
 October 2022
 DOI:
 10.1103/PhysRevA.106.043320
 arXiv:
 arXiv:2201.04544
 Bibcode:
 2022PhRvA.106d3320H
 Keywords:

 Condensed Matter  Quantum Gases;
 Physics  Atomic Physics;
 Quantum Physics
 EPrint:
 Phys. Rev. A 106, 043320 (2022)