Abstract
We report on low temperature magneto-conductance measurements of a single modulation-doped GaAs/AlGaAs core–shell nanowire in transverse magnetic field. Information on the phase coherence length lϕ is obtained from quantum conductivity corrections due to weak localization effects or universal conductance fluctuation. The nanowires are totally coherent at very low temperature and lϕ could be larger than 250nm at 4K. The temperature dependence of lϕ shows that the main dephasing mechanism is the one-dimensional electron–electron scattering mechanism.
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