Theoretical study of photo control of excitonic insulators and high-harmonic generation using realistic models

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23425
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Murakami Yuta 東京工業大学, 理学院, 助教 (70845289)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: 非平衡物性理論 / 励起子絶縁体 / 高次高調波発生

Outline of Final Research Achievements

In this project, we aim to theoretically study possible control of excitonic insulators out of equilibrium and to reveal the origin of the high-harmonic generation in strongly correlated systems using multi-orbital models.
In the study of excitonic insulators out of equilibrium, we revealed that there emerges, in the prethermal regime, a noneqilibrium ordered phase with no analogue in equilibrium, In the study of the high-harmonic generation, we showed that excitation structures peculiar in strongly correlated systems play an essential role.

Free Research Field

非平衡物性理論

Academic Significance and Societal Importance of the Research Achievements

本研究は、近年非平衡物性の分野で注目を集めている励起子絶縁体のダイナミクスと高次高調波発生に焦点を当てている。我々の研究成果は、光を用いた物性操作に関する新しい指針を提供しており、今後あたらしいタイプの光誘起相転移や高次高調波発生の観測につながると期待される。また、長期的にはこれらの成果をベースにして光高速スイッチングや通信デバイスへの応用も期待される。