Mesoscopic proximity effect probed through superconducting tunneling contacts

Article

关键词: JUNCTIONS;    TRANSPORT;    DENSITY;    STATES;   

DOI  :  10.1103/PhysRevB.62.5353

来源: SCIE

【 摘 要 】

We investigate the properties of complex mesoscopic superconducting-normal hybrid devices, Andreev Interferometers in the case where the current is probed through a superconducting tunneling contact whereas the proximity effect is generated by a transparent SN interface. We show within the quasiclassical Green's-functions technique, how the fundamental SNIS element of such structures can be mapped onto an effective S'IS junction, where S' is the proximized material with an effective energy gap E-g0 the conductance shows a peak at V = Delta - E-g. We propose the Andreev interferometer, where E-g can be tuned by an external phase phi and displays maxima at 0 mod 2 pi and minima at pi mod 2 pi. This leads to peculiar current-phase relations, which depart from a zero-phase maximum or minimum depending on the bias voltage and can even show intermediate extreme at V approximate to Delta We propose an experiment to verify our predictions and show how our results are consistent with recent, unexplained experimental results.

【 授权许可】

Free