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Single crystals of Sn0.02Bi1.08Sb0.9Te2S are grown and their transport properties are evaluated to precisely measure the quantum Hall effect on the metallic surface state of the topological insulator. The temperature dependence of the electrical resistance of the bulk samples is determined. The conduction in the material is explained by the parallelism of the inner bulk conduction and the metallic...
Single electron pumping by a SINIS turnstile is investigated up to 1 GHz in various conditions to realize a quantum current standard. A standard deviation of the pumping current at 100 MHz is about 10−4 at base temperature of a dilution refrigerator. As expected, the plateau of the pumped current degrades as temperature increases because of the thermal smearing of Fermi energy of a normal metal island...
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