Nanoscale edge effects on graphene and related materials
若林 克法 教授
Electronic states of graphene are well described as massless Dirac fermion. The presence of edges, however, makes strong implications for the spectrum of the electrons. As first, I will briefly give overview of edge and nanoscale effects on magnetic and transport properties of graphene nanostructures . It is known that edge states can induce spin-polarization with ferromagnetic correlation along the zigzag edges. Our recent many-body analysis shows that the system becomes metallic and magnetic ground states by hole doping . Graphene nanoribbons can possess a perfectly conducting channel when the intervalley scattering is sufficiently suppressed. The mechanism is owing to the breaking of pseudo-time reversal symmetry . We will discuss the possible formation mechanism of quasi-bound states in graphene quantum point contacts . In further, we also discuss our recent work on electronic properties of carbon nanotubes under circularly polarized light, which show the valley polarization of electrons .
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