Experimental evidence of optical analogue of electromagnetically induced   transparency in graphene
  We demonstrate the first experimental observation of coherent population oscillation, an optical analogue of electromagnetically induced transparency, in graphene based on phase sensitive pump-probe system. Degenerate four-wave-mixing between pump and probe modifies the dispersion and absorption of the population oscillation process in graphene, and leads to enhance and depression of modulation instability with asymmetry in frequency. The analytically predicted asymmetrical burning hole fully consists with the experiments. 
Lei Gao, Tao Zhu, Min Liu, Wei Huang, Yu Jia Li, and Cong Gao
physics.optics