@article{magnetlesscirculatorsbasedonsynthetic,
  title = {Magnetless Circulators Based on Synthetic Angular-Momentum Bias: Recent Advances and Applications},
  author = {Ahmed Kord and Andrea Alu},
  year = {2020},
  eprint = {2012.03164},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2012.03164v1},
}