@misc{ronagel2013nano,
  title={A nano heat engine beyond the Carnot limit},
  author={Johannes Roßnagel and Obinna Abah and Ferdinand Schmidt-Kaler and Kilian Singer and Eric Lutz},
  year={2013},
  eprint={1308.5935},
  archivePrefix={arXiv},
  primaryClass={quant-ph},
  url={https://arxiv.org/abs/1308.5935}
}