We have measured the low-bias four-probe conductance of carbon nanotubes as a function of magnetic field parallel to the tube axis. The measured data showed a clear energy gap near the Fermi level whose magnitude changed with the magnetic field. The electrical transport properties of the nanotube turned out to be critically dependent on the change of energy gap. The periodic oscillation of the magnetoresistance of a carbon nanotube can be explained by the periodic modulation of the energy gap with the magnetic field.
Bibliographical noteFunding Information:
This work was supported by Korea Research Foundation Grant (KRF-99-015-DP0128), BK21 project, the KRISS project No. 99-0502-001, and also by Nano Structure Project supported by the Ministry of Science and Technology, Korea.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry