@article{PhysRevFocus.11.24,
  title = {Spin Currents\char21{}Free of Charge},
  author = {Cho, Adrian},
  journal = {Phys. Rev. Focus},
  volume = {11},
  issue = {},
  pages = {24},
  numpages = {1},
  year = {2003},
  month = {May},
  doi = {10.1103/PhysRevFocus.11.24},
  url = {http://link.aps.org/doi/10.1103/PhysRevFocus.11.24},
  publisher = {American Physical Society}
}