Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-19
Phys. Rev. B, 77 (2008) 045429
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 11 figures
Scientific paper
10.1103/PhysRevB.77.045429
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 $t\gg \hbar/\tau$ with $\tau$ 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 multiband 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.
Hirasawa Lila
Nakamura Masaaki
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