Tunneling Conductance in Correlated Graphenes
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Line shape of tunneling conductance observed for a correlated graphene is studied theoretically. We focus on the line shape of scanning tunneling spectroscopy (STS) for a doped graphene flake. We obtain the STS line shape in terms of elastic tunneling of a Kondo singlet through the coherent tunneling levels that are formed due to two reservoirs within coherent regime. The resonant tunneling of a singlet through this coherent tunneling level causes the abrupt increase in tunneling conductance at a finite bias. The shifted position of Dirac point from the Fermi level is responsible for making the line shape of tunneling conductance asymmetric.
KeywordsTunneling Conductance Kondo Singlet Doped Graphene Coherent Tunneling Dirac Point
This research was supported by Basic Science Research Program through the NRF, Korea (2012R1A1A2005220) and partially supported by KIAS grant funded by MEST.
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