Spatio-temporal hierarchy in light-irradiated open many-body systems

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14394
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Tohoku University
• Principal Investigator: Ono Atsushi 東北大学, 理学研究科, 助教 (40845848)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 光物性 / 光誘起相転移 / 光電場駆動 / 実時間ダイナミクス

Outline of Final Research Achievements

In this research project, we conducted a theoretical study focusing on the temporal and spatial dynamics induced by light irradiation in strongly correlated many-body systems, particularly the transient processes in which macroscopic ordered states are formed from microscopic quantum states. In magnetic materials with spatial inversion symmetry, we found that non-thermal states of electrons driven by optical fields stabilize various magnetic ordered states, such as spin scalar chiral states and 120-degree Neel states, through mechanisms different from those known in equilibrium systems. Additionally, we revealed that such optical driving of electrons enables the control of staggered magnetization directions in antiferromagnetic materials and allows for the spectroscopy of quasiparticle band structures even in strongly correlated systems.

Free Research Field

非平衡量子物性

Academic Significance and Societal Importance of the Research Achievements

本研究成果は，レーザーなどの光照射によって生じる非平衡状態において，平衡状態の性質からは予想されない新奇な現象が生じることを具体的に示しており，非平衡系の豊かな物理の一端を明らかにしたものである．この知見は，非平衡物理学や光物性物理学における新たな研究の方向性を与えるだけではなく，将来的には従来の限界を超えた新たなデバイスの基礎原理にも繋がる可能性があるものと期待される．