@ARTICLE{,
  author = {Mills, Michael and Puri, Prateek and Li, Ming and Schowalter, Steven J. and Dunning, Alexander and Schneider, Christian and Kotochigova, Svetlana and Hudson, Eric R.},
  title = {Engineering Excited-State Interactions at Ultracold Temperatures},
  journal = {Phys. Rev. Lett.},
  year = {2019},
  volume = {122},
  number = {23},
  pages = {233401},
  month = {jun},
  url = {https://link.aps.org/doi/10.1103/PhysRevLett.122.233401},
  doi = {10.1103/PhysRevLett.122.233401},
  abstract = {Using a recently developed method for precisely controlling collision energy, we observe a dramatic suppression of inelastic collisions between an atom and ion ($\text{Ca}+{\text{Yb}}^{+}$) at low collision energy. This suppression, which is expected to be a universal phenomenon, arises when the spontaneous emission lifetime of the excited state is comparable to or shorter than the collision complex lifetime. We develop a technique to remove this suppression and engineer excited-state interactions. By dressing the system with a strong catalyst laser, a significant fraction of the collision complexes can be excited at a specified atom-ion separation. This technique allows excited-state collisions to be studied, even at ultracold temperature, and provides a general method for engineering ultracold excited-state interactions.}
}