Dark-state sideband cooling in an atomic ensemble
Abstract
We utilize the dark state in a {\Lambda}-type three-level system to cool an ensemble of 85Rb atoms in an optical lattice [Morigi et al., Phys. Rev. Lett. 85, 4458 (2000)]. The common suppression of the carrier transition of atoms with different vibrational frequencies allows them to reach a subrecoil temperature of 100 nK after being released from the optical lattice. A nearly zero vibrational quantum number is determined from the time-of-flight measurements and adiabatic expansion process. The features of sideband cooling are examined in various parameter spaces. Our results show that dark-state sideband cooling is a simple and compelling method for preparing a large ensemble of atoms into their vibrational ground state of a harmonic potential and can be generalized to different species of atoms and molecules for studying ultracold physics that demands recoil temperature and below.
Cite
@article{arxiv.2101.04309,
title = {Dark-state sideband cooling in an atomic ensemble},
author = {Chang Huang and Shijie Chai and Shau-Yu Lan},
journal= {arXiv preprint arXiv:2101.04309},
year = {2021}
}