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Electrical Transport in Rings of Single-Wall Nanotubes: One-Dimensional Localization

2000; American Physical Society; Volume: 84; Issue: 19 Linguagem: Inglês

10.1103/physrevlett.84.4441

1092-0145

Herbert Shea, Richard Martel, Phaedon Avouris,

Quantum and electron transport phenomena

We report low-temperature magnetoresistance (MR) measurements on rings of single-wall carbon nanotubes. Negative MR characteristic of weak one-dimensional localization is clearly observed from 3.0 to 60 K, and the coherence length ${L}_{\ensuremath{\phi}}$ is obtained as a function of temperature. The dominant dephasing mechanism is identified as electron-electron scattering. Below 1 K, we observe a transition from weak to strong localization, and below 0.7 K a weak antilocalization is induced by spin-orbit scattering.