Rapid generation of all-optical K39 Bose-Einstein condensates using a low-field Feshbach resonance
Year: 2022
Type: article
Abstract: Ultracold potassium is an interesting candidate for quantum technology applications and fundamental research as it allows controlling 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 magnetic fields as free parameters. We investigate the production of all-optical $^{39}\mathrm{K}$ Bose-Einstein 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 $5.8\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms within $850\text{\ensuremath{-}}\mathrm{ms}$ evaporation time at a scattering length of $232{a}_{0}$ and $1.6\ifmmode\times\else\texttimes\fi{}{10}^{5}$ atoms within $3.9\phantom{\rule{0.16em}{0ex}}\mathrm{s}$ 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 high-flux sources of ultracold potassium for inertial sensing.
Source: Physical Review A
Authors: A. Herbst, H. Albers, K. Stolzenberg, S. Bode, D. Schlippert
Institution: Leibniz University Hannover
Language: Latvian
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,675
Awards: G3435114132, G40493870, G4285572622, EXC 2123: QuantumFrontiers Licht und Materie an der Quantengrenze, SFB 1227: Designte Quantenzustände der Materie (DQmat) Herstellung, Manipulation und Detektion für metrologische Anwendungen und Tests fundamentaler Physik, G745383156, G7664755745, G8754122501
OpenAlex ID: W4306993230