Search of Rashba superconductors in atomic-layer surface alloys

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17727
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: National Institute for Materials Science
• Principal Investigator: Yoshizawa Shunsuke 国立研究開発法人物質・材料研究機構, 若手国際研究センター, ICYS 研究員 (60583276)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 超伝導 / ラシュバ効果 / 電気伝導

Outline of Final Research Achievements

We investigated "Rashba superconductor," where superconductivity takes place in the energy bands exhibiting the Rashba effect, in atomic-layer materials grown on semiconductor surfaces. We performed transport measurement of the Si(111)-(√7×√3)-In superconductor in magnetic fields parallel and perpendicular to the surface. The estimated critical field at zero temperature was found to be larger than the Pauli limit of 6 T determined from the critical temperature of 3 K. Our ab initio calculations revealed the spin splitting of the energy bands. These results show that this material is a Rashba superconductor.

Free Research Field

低温物性、表面科学