Carrier-doping into Kitaev spin liquids by soft chemical process

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K21837
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 13:Condensed matter physics and related fields
• Research Institution: Tohoku University
• Principal Investigator: Ohgushi Kenya 東北大学, 理学研究科, 教授 (30455331)
• Co-Investigator(Kenkyū-buntansha): 今井 良宗 東北大学, 理学研究科, 准教授 (30435599) ; 青山 拓也 東北大学, 理学研究科, 助教 (80757261)
• Project Period (FY): 2019-06-28 – 2021-03-31
• Keywords: キタエフスピン液体 / キャリアドーピング / 電荷整列 / ソフト化学法 / 高圧合成

Outline of Final Research Achievements

By using various synthesis methods, we have developed several new materials that are located in the vicinity of Kitaev spin liquids. By employing the high-pressure synthesis method, we obtained RuBr3 and RuI3, which have electronic states similar to those of Kitaev spin liquid and strongly correlated semimetal, respectively. It was also found that the solid solutions of RuBr3 and RuI3 exhibit a bandwidth-controlled-type Mott transition. By employing the soft chemical method, we obtained the carrier-doped system of RuCl3, which shows a metal-insulator transition due to the charge ordering. It was also found that the magnetic ordering observed in RuCl3 is fully suppressed in the carrier-doped system.

Free Research Field

物性物理

Academic Significance and Societal Importance of the Research Achievements

キタエフスピン液体におけるマヨラナ励起は、量子コンピュータに応用することができる。本研究により得た新物質の電子状態を、微視的観点からさらに深く理解することで、より理想的なキタエフスピン液体を具現し量子コンピュータへ応用することへ前進することができる。また、本研究により得た新物質開発の指針は固体化学分野へ波及効果があり、その指針を採ることで将来さらなる新物質が生み出されることが期待される。