Superconducting junction of a single-crystalline Au nanowire for an ideal Josephson device

Minkyung Jung, Hyunho Noh, Yong Joo Doh, Woon Song, Yonuk Chong, Mahn-Soo Choi, Youngdong Yoo, Kwanyong Seo, Nam Kim, Byung Chill Woo, Bongsoo Kim, Jinhee Kim

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We report on the fabrication and measurements of a superconducting junction of a single-crystalline Au nanowire, connected to Al electrodes. The current-voltage characteristic curve shows a clear supercurrent branch below the superconducting transition temperature of Al and quantized voltage plateaus on application of microwave radiation, as expected from Josephson relations. Highly transparent (0.95) contacts very close to an ideal limit of 1 are formed at the interface between the normal metal (Au) and the superconductor (Al). The very high transparency is ascribed to the single crystallinity of a Au nanowire and the formation of an oxide-free contact between Au and Al. The subgap structures of the differential conductance are well explained by coherent multiple Andreev reflections (MAR), the hallmark of mesoscopic Josephson junctions. These observations demonstrate that single crystalline Au nanowires can be employed to develop novel quantum devices utilizing coherent electrical transport.

Original languageEnglish
Pages (from-to)2271-2276
Number of pages6
JournalACS Nano
Volume5
Issue number3
DOIs
Publication statusPublished - 2011 Mar 22

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Keywords

  • Au nanowire
  • Josephson junction
  • Shapiro step
  • single-crystalline
  • superconducting proximity effect

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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