Abstract
A Comment on the Letter by I. Bialynicki-Birula and Z. Bialynicka-Birula, Phys. Rev. Lett. 108, 140401 (2012). The authors of the Letter offer a Reply.
- Received 11 June 2012
DOI:https://doi.org/10.1103/PhysRevLett.109.188901
© 2012 American Physical Society