Andreev-reflection-induced conductance diffraction in mesoscopic normal-metal/superconductor interfaces

Hu Jong Lee, Yun Sok Shin, Hye Mi So, Ju Jin Kim, Nam Kim, Kyung Hwa Yoo

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We observed conductance oscillations, which arose from the interference of quasiparticles Andreev-reflected from a mesoscopic, single normal-metal/superconductor (N/S) interface with a phase gradient along its width. A 10 × 10 μm2 Al island was overlaid on a pre-evaporated 0.5-μm-wide silver wire. The phase gradient along the N/S interface was induced by applying a magnetic field perpendicular to the plane of the superconducting Al island. The conductance across the N/S interface showed Fraunhofer-like oscillations with amplitudes of a small fraction of 2e2/h. For sufficiently low fields and temperatures, this interfacial diffraction effect of quasiparticles is more complicated due to the field-induced electron-hole dephasing effect. The overall magnetic-field and temperature dependencies of the conductance oscillations are qualitatively consistent with the predicted diffraction of Andreev-reflected quasiparticles.

Original languageEnglish
Pages (from-to)534-539
Number of pages6
JournalJournal of the Korean Physical Society
Volume39
Issue number3
Publication statusPublished - 2001 Sep 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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