Comprehensive electrical transport studies are performed on InSb nanowires by varying temperature, gate voltage, and magnetic field. The 3-dimensional bulk conduction is found to dominate in the nanowire channel after investigating a large number of nanowires with different diameters, which show approximately a linear relation between the conductance normalized to the length and the wire cross section. At low temperatures, universal conductance fluctuations are observed. From the amplitude and the correlation voltage of the conductance fluctuations, the phase-coherence length in InSb nanowires is determined at various temperatures.
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