Weak localization and dimensional crossover in carbon nanotube systems
Abstract
We investigate the effects of magnetic and electric fields on electron wavefunction
interactions in single walled carbon nanotube bundles. The magnetoresistance measurements
performed at 4.2 K and the dependence of the data upon the electric field reveal good
agreement with weak localization theory. An electrical field conditioned characteristic
length is associated to ohmic-non ohmic transition, observed below 85 K, in current
voltage characteristics. This length results equal to the average bundles diameter just at
T ≅ 85 K, indicating that 2D–3D crossover is responsible for the
observed conductance transition.
