Ballistic corrections to weaklocalization conductance of carbon nanotubes
Abstract
In the usual formulation of the weak localization(WL) effect, the mean free path of the conduction electron is assumed to be smaller than the geometric size of conductors. In multiwalled carbon nanotubes, however, the mean free path l is usually larger than its radius R. We consider ballistic correction to the usual WL conductance of multiwalled nanotubes within a semiclassical theory of disordered conductors. The ballistic correction to WL magnetoconductance is significant when the winding number of the associated interference paths is smaller than ∼l/(2πR). In this regime, ballistic paths along the circumference of the nanotube cause an additional correction δG∼G/(k_{F}R), where k_{F} is the Fermi wave vector. The ballistic corrections to the frequencydependent conductance are significant when the frequency becomes comparable to the elastic scattering rate.
 Publication:

Physical Review B
 Pub Date:
 May 2004
 DOI:
 10.1103/PhysRevB.69.205403
 Bibcode:
 2004PhRvB..69t5403L
 Keywords:

 73.23.b;
 03.65.w;
 72.15.v;
 Electronic transport in mesoscopic systems;
 Quantum mechanics;
 Electronic conduction in metals and alloys