[1/27] The 8th WPI-AIMR Joint Seminar in FY2016


The 8th WPI-AIMR Joint Seminar in FY2016


Nanoscale edge effects on graphene and related materials


Prof. Katsunori Wakabayashi
(School of Science and Technology, Kwansei Gakuin University)


January 27 (Fri.), 2016 14:30-15:30


Seminar Room, 2nd floor, WPI-AIMR Main Bldg.


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 [1]. 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 [2]. 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 [3]. We will discuss the possible formation mechanism of quasi-bound states in graphene quantum point contacts [4]. 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 [5].

  • [1] K. Wakabayashi, et.al., Sci. Technol. Adv. Mat. 11, 054504 (2010).
  • [2] S. Dutta, and K. Wakabayashi, Sci. Rep. 2, 519 (2012)
  • [3] K. Wakabayashi, et.al., Phys. Rev. Lett. 99, 036601 (2007); CARBON 47, 124 (2009)
  • [4] H.-Y. Deng and K. Wakabayashi, Phys. Rev. B90, 115413 (2014); Phys. Rev. B90, 045402 (2014); Phys. Rev. B89, 045423 (2014).
  • [5]. Liu, Y. Nakajima, K. Wakabayashi, Appl. Phys. Exp. 9, 085101 (2016).




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