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Andreev transport in quantum dots and Josephson effect in spin-orbit coupled thin films

Abstract : Josephson junctions are the building blocks of superconducting electronics. They are made of two superconductors separated by an insulating barrier. In this thesis, we present two experiments where the insulating barrier is replaced by a semiconductor. In the first one, we study nanowires in the regime of Coulomb blockade, where the number of electrons can be controlled, one by one, until a metal-insulator transition is induced. Across this transition, we observed that a single electronic spin behaves like a magnetic impurity and leads to the formation of discrete electronic states between the superconducting electrodes. The understanding of such devices is crucial for the development of superconducting nanoelectronics. 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 is essential in a wide number of theoretical works aiming at discover new phases of matter. We demonstrate that spin-orbit coupling can be probed by phase sensitive measurements of the Josephson current.
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  • HAL Id : tel-02483145, version 2

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Alexandre Assouline. Andreev transport in quantum dots and Josephson effect in spin-orbit coupled thin films. Materials Science [cond-mat.mtrl-sci]. Sorbonne Université, 2018. English. ⟨NNT : 2018SORUS225⟩. ⟨tel-02483145v2⟩

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