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2023 Fiscal Year Final Research Report

Detection of spontaneous magnetization in chiral superconductors using a circularly polarized microwave cavity

Research Project

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Project/Area Number 22K18683
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Hashimoto Kenichiro  東京大学, 大学院新領域創成科学研究科, 准教授 (00634982)

Project Period (FY) 2022-06-30 – 2024-03-31
Keywordsカイラル超伝導 / 円偏波 / 共振器 / マイクロ波 / 円二色性 / 自発磁化
Outline of Final Research Achievements

In this study, we developed a high-Q circularly polarized cavity using rutile, a dielectric material, to establish a new verification method for chiral superconductors. With this resonator, one can detect the tiny spontaneous magnetization expected in a chiral superconductor with high sensitivity. As a test measurement, we conducted Hall conductivity measurements on small single crystals of Bi under a magnetic field, demonstrating the ability of the circularly polarized resonator to detect the off-diagonal components of the conductivity tensor. We plan to construct a circularly polarized cavity operating at dilution refrigerator temperatures to thoroughly verify the feasibility of chiral superconductivity.

Free Research Field

超伝導

Academic Significance and Societal Importance of the Research Achievements

カイラル超伝導体はトポロジカル超伝導体の代表的な候補物質であり、試料表面にマヨラナ粒子が現れることが理論的に指摘されており、その理解はトポロジカル量子計算への応用の観点からも極めて重要である。しかしながら、カイラル超伝導体の検証は実験的に極めて困難であり、候補物質はいくつも報告されているものの、実験的確証には至っていない。したがって、本研究により、カイラル超伝導体の理解が進めば、基礎物理学だけでなく、応用上の観点からも大きな進展が期待される。

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Published: 2025-01-30  

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