3 SIGNATURES OF PHASE-COHERENT ANDREEV REFLECTION

Note

关键词: QUANTUM TRANSPORT;    MESOSCOPIC WIRES;    CONDUCTANCE;    SUPERCONDUCTOR;    FLUCTUATIONS;    MICROJUNCTIONS;    LOCALIZATION;    SYSTEMS;   

DOI  :  10.1103/PhysRevB.48.2811

来源: SCIE

【 摘 要 】

An efficient numerical scheme is developed to compute the differential conductance G(NS) of a disordered normal-metal-superconductor (NS) junction at voltages V and magnetic fields B. A sharp peak is found in G(NS) around V, B = 0 in the case of a resistive NS interface, as observed experimentally and confirming the theory of ''reflectionless tunneling.'' An ideal interface shows a conductance dip, due to an enhanced weak-localization effect. Finally, it is demonstrated that time-reversal-symmetry breaking does not reduce the ''universal conductance fluctuations'' in G(NS) by a factor of 2.

【 授权许可】

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