Spin-orbit interaction in s-electron nanocluster systems enhanced by Rashba effect

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K03738
• 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: Ibaraki University
• Principal Investigator: Nakano Takehito 茨城大学, 理工学研究科(理学野), 准教授 (50362611)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: アルカリ金属 / ナノクラスター / スピン軌道相互作用

Outline of Final Research Achievements

Alkali metal (K, Rb, Cs) nanoclusters in zeolite A, a porous crystal, have been studied in detail by electron spin resonance. A complete picture of the physical quantities directly related to the spin-orbit interaction, such as the ESR linewidth and the g-value shift due to spin-lattice relaxation, has been quantitatively revealed with respect to the electron concentration dependence and the alkali element dependence. The effect of orbital degeneracy in the 1p level of the cluster is found to be very large. The heavy element effect is also very clear. The fundamental knowledge of the spin-orbit interaction in nanoclusters, which are an order of magnitude larger than atoms, is obtained.

Free Research Field

物性物理学（実験）

Academic Significance and Societal Importance of the Research Achievements

原子よりも一回り大きなサイズ領域である金属ナノクラスターにおけるスピン軌道相互作用はこれまであまり詳しく調べられてこなかったが，本研究によってその基礎情報の全貌が明らかになった．また，元来は軌道角運動量を持たないs電子がナノクラスターにおいて強いスピン軌道相互作用を獲得する機構についても明らかになった．これらの知見は，ナノ構造体を構成要素とする機能性新物質の開発指針に役立つ可能性がある．