Electrical transport properties of topological insulator Bi2Te3 nanowires contacted with superconducting electrodes*

Single-crystal Bi2Te3 nanowires were fabricated by template-assisted electrochemical deposition. The electrical transport properties of the nanowires in the temperature range 1.8-300 K were investigated by connecting nonsuperconducting or superconducting electrodes. When the wire was connected to focused-ions beam deposited W-electrodes, a series of exotic quasi-periodic oscillations were found and the amplitude of the oscillations was unusually enhanced near 3.5 K below the Tc, 4.5 K, of W-electrodes. When the wire was connected to nonsuperconducting Pt electrodes, the wire showed positive magnetoresistance accompanied with random fluctuations.