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http://dx.doi.org/10.9714/psac.2019.21.4.013

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))
Publication Information
Progress in Superconductivity and Cryogenics / v.21, no.4, 2019 , pp. 13-18 More about this Journal
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.
Keywords
topological insulator; nanoribbon; superconducting proximity effect; Josephson junction; Shapiro step;
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