SFB Extra Seminar
Josephson junctions are the building blocks of superconducting electronics. They are made of two superconductors separated by an insulating barrier. I will present two experiments where the insulating barrier is replaced by a semiconductor. In the first one , we study nanowires where the number of electrons can be controlled, one by one, until a metal-insulator transition is induced. Across this transition, we observed the evolution of the Andreev spectrum that leads to the Josephson effect. In the second experiment , we study the Josephson effect in thin films where the electron motion is coupled to its spin. This spin-orbit interaction plays a key role in the discovery of new topological phases of matter. I will show that spin-orbit coupling can be probed by phase sensitive measurements of the Josephson current.
 A. Assouline, et al. “Shiba bound states across the mobility edge in doped InAs nanowires”, Phys. Rev. Lett. 119, 097701 (2017).
 A. Assouline et al. “Spin-Orbit induced phase-shift in Bi2Se3 Josephson junctions”, Nature Communications 10, 126 (2019).