Ultracold atom study of exotic phenomena bridging different hierarchies

2022 Fiscal Year Final Research Report

• Project Area: Clustering as a window on the hierarchical structure of quantum systems
• Project/Area Number: 18H05405
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Kyoto University
• Principal Investigator: TAKAHASHI YOSHIRO 京都大学, 理学研究科, 教授 (40226907)
• Co-Investigator(Kenkyū-buntansha): 西田 祐介 東京工業大学, 理学院, 准教授 (80704288)
• Project Period (FY): 2018-06-29 – 2023-03-31
• Keywords: 冷却原子 / フェッシュバッハ共鳴 / エフィモフ3体 / エルビウム原子 / リチウム原子

Outline of Final Research Achievements

We successfully created the ultracold atomic mixture of Er, Yb, and Li which has a large imbalance, and established the inter-species Feshbach resonance technique which can arbitrarily control the inter-species interaction. As a result, we successfully obtained the experimental result suggesting the creation of novel Efimov trimer state with an angular momentum, which is only possible for large mass-imbalance system. In addition, we performed the high-resolution laser spectroscopy for atoms in an optical lattice by exploiting the Feshbach resonance between the ground and metastable states of Yb atoms. This reveals the three-body force of atoms in an optical lattice, explained by our theoretical calculations.

Free Research Field

原子物理

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により、これまで主に凝縮系を対象として研究されていた冷却原子量子シミュレーションの手法の適用範囲を広げ、特に、原子核系の３体力などの、異なる階層の興味深い重要問題に対して適用できることを、実際に実験研究を遂行することにより示すことができた。また、少数量子多体系に対する高度な制御・測定技術や巨大質量比の量子気体混合系の生成技術は、量子計算の実現に直結する。