Manifestation and control of superconductivity in semiconductor surface reconstructions

2015 Fiscal Year Final Research Report

• Project/Area Number: 25247053
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: National Institute for Materials Science
• Principal Investigator: Uchihashi Takshi 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, MANA研究者 (90354331)
• Co-Investigator(Kenkyū-buntansha): SAKAMOTO Kazuyuki 千葉大学, 融合科学研究科, 教授 (70261542)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 超伝導 / 表面超構造 / 二次元 / 原子層 / 有機分子 / 電気伝導 / 走査トンネル顕微鏡 / 超高真空

Outline of Final Research Achievements

We have studied the superconductivity of the Si(111)-(root7xroot3)-In surface reconstruction, which consists of indium atomic layers on a silicon surface, through electron transport measurement, scanning tunneling microscopy, and angle-resolved photoelectron spectroscopy. Our results include the observation of superconducting fluctuations inherent in a two-dimensional system, the discovery of Josephson vortices at surface atomic steps, the real-space observation of a disorder-induced superconductor-metal transition, and the control of superconductivity using the charge transfer and spins originating from organic molecules. We have also found anisotropic Dirac-like electronic states of self-assembled radical organic molecules.

Free Research Field

超伝導、低温物性実験、表面科学