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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Phase-sensitive transport at a normal metal-superconductor interface close to a Josephson junction

Résumé

Phase- and voltage bias-sensitive quasiparticle transport at a double NIS1IS2 interface is considered. The barriers I range from tunnel to transparent, and the intermediate region S1 has a width comparable to the superconducting coherence length. A phase difference phi is applied to the Josephson junction S1IS2. The normal and Andreev reflections at the NIS1 interface become phi-sensitive, and transport is governed by interferences within the narrow S1 region, both in the normal and anomalous channels. The subgap conductance is separately (energy E)- and (phase phi)- symmetric. Above the superconducting gap, the conductance is in general not symmetric even if $(E,phi)$ is changed in $(-E,-phi)$, but the symmetry is restored by averaging Fermi oscillations. The Tomasch oscillations are amplified by the phase difference. The subgap conductance exhibits a resonant structure at the energy of the Andreev bound states (ABS) of the S1IS2 junction, providing a side-spectroscopy of such states. Depending on the relative transparencies of the junctions, the resonance can increase or reduce the conductance, and it can even vanish for phi=pi, featuring total reflection of quasiparticles at NS1 by the ABS at S1S2.

Dates et versions

hal-00979481 , version 1 (16-04-2014)

Identifiants

Citer

David Gosselin, Gaston Hornecker, Régis Mélin, Denis Feinberg. Phase-sensitive transport at a normal metal-superconductor interface close to a Josephson junction. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 89 (7), pp.075415. ⟨10.1103/PhysRevB.89.075415⟩. ⟨hal-00979481⟩

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