Conductance measurements of carbon nanotubes containing gated local depletion regions exhibit plateaus as a function of gate voltage, spaced by approximately e2/h, the quantum of conductance for a single (non-degenerate) mode. Plateau structure is investigated as a function of bias voltage, temperature, and magnetic field. We speculate on the origin of this surprising quantization, which appears to lack band and spin degeneracy.
@article{arxiv.cond-mat/0406652,
title = {Anomalous Conductance Quantization in Carbon Nanotubes},
author = {M. J. Biercuk and N. Mason and J. Martin and A. Yacoby and C. M. Marcus},
journal= {arXiv preprint arXiv:cond-mat/0406652},
year = {2009}
}