Andreev tunneling enhanced by Coulomb oscillations in superconductor-semiconductor hybrid Ge/Si nanowire devices

ORAL

Abstract

We explore the magneto-conductance of Ge/Si core/shell nanowire quantum dot devices contacted by superconducting leads. Significant magneto-conductance peaks around zero field are observed and show a periodic modulation with gate voltage as discrete states of the quantum dot are turned on- and off-resonance with the Fermi energy in the superconducting electrodes. The ability to create and control coherent transport in superconductor-semiconductor hybrid nanostructures allows for new opportunities in the study of various fundamental competing effects such as superconductivity and electron-electron interactions.

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Authors

  • Xiaojie Hao

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China; University of Michigan, USA

  • Tao Tu

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Hai-Ou Li

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Cheng Zhou

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Gang Cao

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Guang-Can Guo

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Guo-Ping Guo

    • Key Laboratory of Quantum Information, CAS, University of Science and Technology of China, Hefei, China

  • Wayne Fung

    • Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, USA

  • Zhongqing Ji

    • Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, USA

  • Wei Lu

    • Department of Electrical Engineering and Computer Science, The University of Michigan, Ann Arbor, USA