Drive the Dirac electrons into Cooper pairs in SrxBi2Se3

Guan Du, Jifeng Shao, Xiong Yang, Zengyi Du, Delong Fang, Jinghui Wang, Kejing Ran, Jinsheng Wen, Changjin Zhang (), Huan Yang (), Yuheng Zhang and Hai-Hu Wen ()
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Guan Du: Nanjing University
Jifeng Shao: High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China
Xiong Yang: Nanjing University
Zengyi Du: Nanjing University
Delong Fang: Nanjing University
Jinghui Wang: Nanjing University
Kejing Ran: Nanjing University
Jinsheng Wen: Nanjing University
Changjin Zhang: High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China
Huan Yang: Nanjing University
Yuheng Zhang: High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China
Hai-Hu Wen: Nanjing University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Topological superconductors are a very interesting and frontier topic in condensed matter physics. Despite the tremendous efforts in exploring topological superconductivity, its presence is however still under heavy debate. The Dirac electrons have been proven to exist on the surface of a topological insulator. It remains unclear whether and how the Dirac electrons fall into Cooper pairing in an intrinsic superconductor with the topological surface states. Here we show the systematic study of scanning tunnelling microscope/spectroscopy on the possible topological superconductor SrxBi2Se3. We first demonstrate that only the intercalated Sr atoms can induce superconductivity. Then we show the full superconducting gaps without any in-gap density of states as expected theoretically for a bulk topological superconductor. Finally, we find that the surface Dirac electrons will simultaneously condense into the superconducting state within the superconducting gap. This vividly demonstrates how the surface Dirac electrons are driven into Cooper pairs.

Date: 2017
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DOI: 10.1038/ncomms14466

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