Abstract After a brief description of hybrid superconducting-normal nanostructures and a brief introduction of the Andreev reflection, we present a theoretical investigation of the electron tunneling through a normal-metal/quantum-dot/superconductor (N-QD-S) system where multiple discrete levels of the QD is considered. By using the nonequilibrium-Green-function (NGF) method, the current I is obtained and studied in detail. We find that the Andreev tunneling shows clear resonant behavior, as obtained in previous works. Moreover, the current I versus the gate voltage Vg exhibits different kinds of peaks, depending on the bias voltage, the level-spacing of the QD, and the energy gap of the superconducting electrode. Besides, in I-V characteristics extra peaks superimposed on the conventional current plateaus emerge, which stem from the resonant Andreev reflections.
Received: 11 February 2001
Accepted manuscript online:
Fund: Project supported by the Visiting Scholar Foundation of Key State Laboratory for Mesoscopic Physics in Peking University and by National Natural Science Foundation of China (Grant No.10074001).
Cite this article:
Lin Tsung-han (林宗涵) RESONANT ANDREEV REFLECTION IN HYBRID SUPERCONDUCTING-NORMAL NANOSTRUTURES 2001 Chinese Physics 10 4
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