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2021 Fiscal Year Final Research Report

Simulation study of spin polarized positron annihilation

Research Project

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Project/Area Number 17K05118
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Quantum beam science
Research InstitutionKanazawa University

Principal Investigator

Saito Mineo  金沢大学, 数物科学系, 教授 (60377398)

Project Period (FY) 2017-04-01 – 2022-03-31
Keywordsスピン偏極陽電子消滅 / 運動量密度 / 密度汎関数理論
Outline of Final Research Achievements

Spin-polarized positron annihilation method was used to study cation vacancies in II-VI and III-V wide-gap semiconductors. We clarified irreducible representations of defect levels and revealed that the relation between the symmetry of the defects and electronic spin polarization. We also suggested that the difference between the momentum densities of majority and minority spins in ferromagnetic metals originates from the electron many-body effect. Furthermore, we clarified that the spin-orbit interaction affects momentum densities.

Free Research Field

物性科学

Academic Significance and Societal Importance of the Research Achievements

物質のスピン分極を観測することのできる新しい研究手法であるスピン偏極陽電子消滅実験手法の可能性を、第一原理計算の実行により明らかにした。ワイドギャップ半導体中陽イオン空孔のスピン分極のメカニズムを明らかにした。また、強磁性金属における多数スピンおよび少数スピンに対する運動量密度を観測することで、電子の多体効果について有益な情報を得ることができることを示した。

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Published: 2023-01-30  

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