“…Experimentally, the Landau levels in graphene have been observed by measuring cyclotron resonances of the electrons and holes in infrared spectroscopy experiments [11] and by measuring tunneling current in scanning tunneling spectroscopy experiments [12]. The experimental study of the n = 0 Landau level has attracted a great deal of attention, and has evolved rapidly, as better quality samples become available, and higher magnetic fields and lower temperatures were studied ( [13], [14], [15], [16]), but in particular, Landau level mixing is neglected (see [17], [18]), and this is not as clearly justified because the single particle Landau level gaps in graphene scale as √ B, which is the same as the interaction strength [19]. In turn, only optical transitions between Landau levels has been calculated.…”