We describe a procedure for engineering beams of cold atoms by selectively draining particles from a trapped gas based on momenta. Atoms escape through a filter potential that only transmits atoms with the desired momenta. We outline an algorithm that outputs a filter potential that produces a pre-specified beam momentum profile. We illustrate this procedure for the case of a narrow band-pass (NBP) quantum filter. Lastly, we discuss the application of the NBP filter for probing the self-energy and effective mass of Bose polarons, as well as the corresponding Landau criterion.
@article{arxiv.1903.11462,
title = {Engineering momentum profiles of cold-atom beams},
author = {D Hudson Smith and Artem G Volosniev},
journal= {arXiv preprint arXiv:1903.11462},
year = {2019}
}