Josephson coupling through one-dimensional ballistic channel in semiconductor-superconductor hybrid quantum point contacts

Hiroshi Irie, Yuichi Harada, Hiroki Sugiyama, Tatsushi Akazaki

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We study a superconducting quantum point contact made of a narrow In0.75Ga0.25As channel with Nb proximity electrodes. The narrow channel is formed in a gate-fitted constriction of InGaAs/InAlAs/InP heterostructure hosting a two-dimensional electron gas. When the channel opening is varied with the gate, the Josephson critical current exhibits a discretized variation that arises from the quantization of the transverse momentum in the channel. The quantization of Josephson critical current persists down to the single-channel regime, providing an unambiguous demonstration of a semiconductor-superconductor hybrid Josephson junction involving only a single ballistic channel.

Original languageEnglish
Article number165415
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number16
DOIs
Publication statusPublished - Apr 21 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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