Abstract
We apply gain and loss to honeycomb photonic lattices and show that the dispersion relation is identical to tachyons—particles with imaginary mass that travel faster than the speed of light. This is accompanied by -symmetry breaking in this structure. We further show that the -symmetry can be restored by deforming the lattice.
- Received 21 April 2011
DOI:https://doi.org/10.1103/PhysRevA.84.021806
© 2011 American Physical Society