第33回 原研・兵県大合同コロキウム

日時: 平成19年12月6日(木) 16:00〜
Date and time: 6th Dec. (Thu.) 16:00〜
場所: SPring-8, 萌光館
Place: SPring-8, "HOUKOUKAN" seminar room
Title: Electric transport and magnetic properties in multilayer graphene
講演者: 中村正明 氏 (東京理科大学)
Speaker: Dr. Masaaki Nakamura (Tokyo University of Science)
Abstract:

We discuss electric transport and orbital magnetism of multilayer graphenes in a weak magnetic field using the matrix decomposition technique. At zero temperature, the minimum conductivity is given by that of the monolayer system multiplied by the layer number N, independent of the interlayer hopping t. When the interlayer hopping satisfies the condition t ≫\hbar/τ with τ being collision time of impurity scattering, [N/2] kinks and [N/2]+1 plateaux appear in the Fermi energy (gate voltage) dependence of the conductivity and the Hall conductivity, respectively. These behaviors are interpreted as multi-band effects. We also found that the Hall conductivity and the magnetic susceptibility take minimum value as a function of temperature, for certain value of the gate voltage. This behavior is explained by Fermi-energy dependence of these functions at zero temperature.

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