Fast detection of single-charge tunneling to a graphene quantum dot in a   multi-level regime
  In situ tunable radio-frequency charge detection is used for the determination of the tunneling rates into and out of a graphene single quantum dot connected to only one lead. An analytical model for calculating these rates in the multi-level tunneling regime is presented and found to correspond very well to our experimental observations. 
T. M\"uller, J. G\"uttinger, D. Bischoff, S. Hellm\"uller, K. Ensslin,   and T. Ihn
cond-mat.mes-hall