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

Hiroshi Irie, Yuichi Harada, Hiroki Sugiyama, Tatsushi Akazaki

研究成果: ジャーナルへの寄稿学術誌査読

10 被引用数 (Scopus)

抄録

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.

本文言語英語
論文番号165415
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
89
16
DOI
出版ステータス出版済み - 4月 21 2014
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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