日本原子力研究開発機構 (JAEA) / 量子ビーム応用研究部門
放射光科学研究ユニット / 放射光量子シミュレーショングループ
|Date and time:||6th Dec. (Thu.) 16:00〜|
|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)|
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.