Anomalous Conductance Quantization in Carbon Nanotubes
arXiv:cond-mat/0406652 · doi:10.1103/PhysRevLett.94.026801
Abstract
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.
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