Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Superconducting proximity effects in Sb-doped Bi2Se3 topological insulator nanoribbon

  • Park, Sang-Il (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)) ;
  • Kim, Hong-Seok (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST)) ;
  • Hou, Yasen (Department of Physics, University of California) ;
  • Yu, Dong (Department of Physics, University of California) ;
  • Doh, Yong-Joo (Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST))
  • Received : 2019.12.04
  • Accepted : 2019.12.21
  • Published : 2019.12.31
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Abstract

Superconducting junctions of topological insulator (TI) are expected to host Majorana bound state, which is essential for developing topological quantum information devices. In this study, we fabricated Josephson junctions (JJs) made of Sb-doped Bi2Se3 TI nanoribbon and PbIn superconducting electrodes. In the normal state, the axial magnetoresistance data exhibit periodic oscillations, so-called Aharonov-Bohm oscillations, due to a metallic surface state of TI nanoribbon. At low temperature of 1.5 K, the TI JJ reveals the superconducting proximity effects, such as the critical current and multiple Andreev reflections. Under the application of microwave, integer Shapiro steps are observed with satisfying the ac Josephson relation. Our observations indicate that highly-transparent superconducting contacts are formed at the interface between TI nanoribbon and conventional superconductor, which would be useful to explore Majorana bound state in TI.

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References

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