Numerical Study of the Dynamical Conductivity in Carbon Nanotubes(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

概要

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The dynamical conductivity in carbon nanotubes in the presence of impurity scattering is studied within the effective mass approximation based on an exact numerical diagonalization of the k・p Hamiltonian. By controlling the Fermi energy and the magnetic flux, the number of conducting channels at the Fermi energy N_c is varied between one, two, and three without breaking symplectic symmetry. The exact dynamical conductivity deviates significantly from that in the self-consistent Born approximation in a small frequency region corresponding to the absence of backscattering for N_c=1, the Anderson localization for N_c=2, and the presence of a perfect conducting channel for N_c=3.
社団法人日本物理学会の論文
2006-09-15