Floquet boundary states in AB -stacked graphite

@article{Calvo2020FloquetBS,
  title={Floquet boundary states in 
AB
-stacked graphite},
  author={Hern{\'a}n L. Calvo and Jose E. Barrios Vargas and Luis E. F. Foa Torres},
  journal={Physical Review B},
  year={2020}
}
We report on the effect of laser illumination with circularly polarized light on the electronic structure of AB-stacked graphite samples. By using Floquet theory in combination with Green's function techniques, we find that the polarized light induces bandgap openings at the Floquet zone edge $\hbar\Omega/2$, bridged by chiral boundary states. These states propagate mainly along the borders of the constituting layers as evidenced from the time-averaged local density of states and probability… 
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