Effect of trigonal warping on anomalous Rabi oscillations in graphene bilayer

In single layer graphene, the recently predicted anomalous Rabi frequency varies linearly with the intensity of applied pump field whereas in bilayer graphene it is proportional to the square of the intensity. In bilayer graphene, when the trigonal warping effect is taken in to account, the anomalous Rabi frequency shows a non-trivial minimum (versus intensity) in addition to the trivial minimum at origin. This non-trivial minimum occurs at the value of intensity of the applied field which corresponds to 2 times the value of the momentum where the leg pockets of the Fermi surface develops, described in a pioneering work of E. McCann et al. [Eup. Phys. J. Special Topics 148, 91 (2007)]. Thereafter the anomalous Rabi frequency varies linearly with the intensity of applied field.