Observation of crossed Andreev reflection by using high polarized nano-pillar and application for quantum bits

2015 Fiscal Year Final Research Report

• Project/Area Number: 26790041
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: Kyushu University
• Principal Investigator: OHNISHI Kohei 九州大学, 理学(系)研究科(研究院), 助教 (30722293)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: スピントロニクス / 超伝導体 / ナノピラー構造 / 交差アンドレーエフ反射

Outline of Final Research Achievements

The purpose of the project is the observation of the crossed Andreev reflection in the novel structure in which the spin polarized current is injected efficiently into the superconductor/normal metal (S/N) bilayer with the very low Joule heating. As a result, the spin polarized component in the charge current could not be injected through the S/N interface. And also, it was experimentally shown that spin polarized electrons and Cooper pairs can co-exist in the normal metal layer. Moreover, by using the spin polarized current, it was realized that forming the superconducting gap at the S/N interface is observed. These results indicates that the S/N bilayer system have some advantage in the measurement in the superconductor-based hybrid nano-structure such as that for the crossed Andreev reflection measurement.

Free Research Field

超伝導スピントロニクス