Figure 1
From: Controllable population dynamics in Landau-quantized graphene
Schematic view of energy bands and optical transitions of graphene system. (a) Energy levels near the Dirac point superimposed on the electron dispersion at zero magnetic field (dashed lines), and the energies of Landau levels for a given magnetic field (solid horizontal lines). (b) The Landau levels with energy quantum numbers n = −2, −1, 0, 1 correspond to the states |1〉, |2〉, |3〉, and |4〉, respectively. A chirped-pulse laser field E1(t) with carrier frequency ω1 couples the transition |1〉 ↔ |4〉 in Landau-quantized graphene. The right- and left-hand circularly polarized components of a continuous-wave (cw) laser field E2 with carrier frequency ω2 drive the transitions |2〉 ↔ |3〉 and |3〉 ↔ |4〉, respectively.
