@article{3950,
  author = {Eric Rosenthal and Benjamin Chapman and Andrew Higginbotham and Joseph Kerckhoff and Konrad Lehnert},
  title = {Breaking Lorentz Reciprocity with Frequency Conversion and Delay},
  year = {2017},
  journal = {Physical Review Letters},
  volume = {119431},
  pages = {147703},
  month = {2017-10},
  issn = {0031-9007},
  url = {https://link.aps.org/doi/10.1103/PhysRevLett.119.147703},
  doi = {10.1103/PhysRevLett.119.147703},
}