Fano-Andreev Transport and Circulating Currents in Mesoscopic Interferometers

다국어 초록 (Multilingual Abstract)

Quantum correlation and interference effects are investigated in mesoscopic interferometers connected to a normal metal and a superconductor. For quasiparticle excitation energies smaller than superconducting gap, a Fano-Andreev antiresonance for zero excitation energy is shown to be split into two zero-transmissions located at energies lower and higher than the Fano-Andreev antiresonance energy. For an excitation energy bigger than the gap, the higher energy antiresonance disappears for electron-like quasiparticle transport. In the presence of a superconductor interface potential <i>Z</i>, we find that the transport and the circulating currents normalized by their amplitudes for a clean interface have the same <i>I</i>(<i>Z</i>)-<i>Z</i> curve. We discuss a transition among the three types of normalized currents, which shows a characteristic transition diagram in association with the excitation energy. Also, as a demonstration of the existence of Andreev holes, we show that only the Andreev hole current can circulate along the interferometer loop.

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