Conductance of disordered semiconducting nanowires and carbon nanotubes: a chain of quantum dots

摘要: A comparative study of the low temperature conductivity an ensemble multiwall carbon nanotubes and semiconductor nanowires is presented. The quasi one-dimensional samples are made in nanoporous templates by electrodeposition CVD growth. Three different structures studied parallel: nanotubes, tellurium nanowires, silicon nanowires. It shown that Coulomb blockade regime dominates electronic transport below 50 K, together with weak strong localization effects. In regime, a scaling law conductance measured as function voltage systematically observed. This allows single parameter α to be defined. accounts for specific realization “disorder”, plays role fingerprint each sample. Correlations between voltage, perpendicular magnetic field, localized 1 K have been performed. universal laws reported. They relate coefficient (1) normalized , (2) phase coherence length (3) activation energy . These observations suggest description wires tubes terms chain quantum dots; break into series islands. dots defined conducting islands typical on order separated poorly regions (low density carriers or potential barriers due defects). corresponding model developed put three common frame.