Quantum one-way street in topologicalinsulator nanowires unibasel NatureNano
, a comparison with the experimental behaviour can then be achieved via the relationcontains small peaks and dips due to an increased scattering rate close to the bottom of a subband, such fluctuations occur on top of a large constant conductivity and we therefore approximateA 2 × 2 cmthin film of BST was grown on a sapphire substrate by co-evaporation of high-purity Bi, Sb and Te in an ultrahigh vacuum MBE chamber.
The thickness varied in the range 14–19 nm in the whole film. Immediately after taking the film out of the MBE chamber, it was capped with a 3-nm-thick Alcapping layer grown by atomic-layer deposition at 80 °C using an Ultratec Savannah S200. The carrier density and the mobility of the film were extracted from Hall measurements performed at 2 K using a Quantum Design PPMS.
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