Study on transport properties and edge states of chiral superconductor with broken time-reversal symmetry

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K03724
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Okayama University of Science
• Principal Investigator: Imai Yoshiki 岡山理科大学, 理学部, 准教授 (10396666)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: 時間反転対称性を破る超伝導 / トポロジカル物質

Outline of Final Research Achievements

The theoretical study on novel superconductivity with time-reversal symmetry breaking was investigated microscopically. In particular, for Pt-based compound superconductors with a honeycomb-type crystal structure, it has been suggested that different superconducting states can be realized depending on the constituent elements. For these systems, we quantitatively evaluated their electronic states and various fluctuation effects using first-principles calculation methods and many-body theories of the electronic structure. As a result, we demonstrated that the superconducting pairing wave function strongly depends on the characteristics of the electronic structure in the low-energy region. The obtained results contribute to the understanding of the microscopic mechanisms behind the emergence of superconducting states with time-reversal symmetry breaking.

Free Research Field

物性II

Academic Significance and Societal Importance of the Research Achievements

次世代デバイスの素材の候補として，省電力性に優れるトポロジカル物質は関心が寄せられている。時間反転対称性を破る超伝導はその有力候補として，現在勢力的に探索が行われており，理論側からのミクロな観点からのアプローチによる実験とのクロスチェックは重要な課題である。本研究ではその低エネルギー領域での電子構造が超伝導状態の出現に大きな寄与を及ぼすことを示しており，今後の新奇物質探索や微視的理解に貢献するものである。