The Dirac equation in solid state physics and non-linear optics
The Dirac equation in solid state physics and non-linear optics
Recently, new two-dimensional materials possessing unique properties have been discovered, the most famous being the graphene. In this materials, electrons at the Fermi level behave as massless particles and can be described by the massless Dirac equation. This phenomenon is quite general, and it is a common features of periodic …