Josephson supercurrent in a topological insulator without a bulk shunt

  title={Josephson supercurrent in a topological insulator without a bulk shunt},
  author={Marieke Snelder and Cor G. Molenaar and Y. Pan and D. Wu and Y. K. Huang and Anne de Visser and A A Golubov and Wilfred G. van der Wiel and Hans Hilgenkamp and Mark S. Golden and Alexander Brinkman},
  journal={Superconductor Science and Technology},
A Josephson supercurrent has been induced into the three-dimensional topological insulator Bi 1.5 ?> Sb 0.5 ?> Te 1.7 ?> Se 1.3 ?> . We show that the transport in Bi 1.5 ?> Sb 0.5 ?> Te 1.7 ?> Se 1.3 ?> exfoliated flakes is dominated by surface states and that the bulk conductivity can be neglected at the temperatures where we study the proximity induced superconductivity. We prepared Josephson junctions with widths in the order of 40 nm and lengths in the order of 50–80 nm on several Bi 1.5… 
17 Citations
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