Abstract Submitted to the NANOTUBE'02 Workshop:

The electronic states of carbon nanotubes under a perpendicular magnetic field are experimentally investigated using transport measurement. The samples have a highly resistive metal/multi-walled carbon nanotube (MWNT)/metal structure with a back gate. The MWNTs are produced by an arc-discharge method and used without further treatment. The current through two metal electrodes under a small voltage show quasi-periodic oscillations as a function of gate voltage, which is attributed to the Coulomb blockade effect. As magnetic field is swept, the current peaks show complicated and reproducible shift, reflecting the modulation of electronic structures by magnetic fields. In some samples, characteristic features can be reproduced in a band calculation based on the Landau level formation theory [1], indicating that the electrons move ballistically in the MWNT.

[1] H. Ajiki and T. Ando, J. Phys. Soc. Japan 62 (1993) 1255.