  A novel mechanism to realize dynamically tunable electromagnetically induced
transparency (EIT) analogue in the terahertz (THz) regime is proposed. By
putting the electrically controllable monolayer graphene under the dark
resonator, the amplitude of the EIT resonance in the metal-based metamaterial
can be modulated substantially via altering the Fermi level of graphene. The
amplitude modulation can be attributed to the change in the damping rate of the
dark mode caused by the recombination effect of the conductive graphene. This
work provides an alternative way to achieve tunable slow light effect and has
potential applications in THz wireless communications.
