Excitation and relaxation dynamics of correlated electron systems

2015 Fiscal Year Final Research Report

• Project/Area Number: 24360036
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Applied physics, general
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Koshibae Wataru 国立研究開発法人理化学研究所, 創発物性科学研究センター, 上級研究員 (20273253)
• Co-Investigator(Kenkyū-buntansha): MORI MICHIYASU 国立研究開発法人日本原子力研究開発機構, 先端基礎研究センター, 研究副主幹 (30396519) ; TSUTSUI KENJI 国立研究開発法人放射線医学総合研究所, 関西光科学研究所放射光科学研究センター, 上席研究員 (80291011)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 光電変換 / skyrmion

Outline of Final Research Achievements

In this project, we theoretically study the real-time dynamics of excitation and relaxation of the electronic states in strongly correlated electron systems. The electron-electron interaction is expressed by the mutual precession of the coupled quantum-electron spin and local classically-ordered spin. We develop a numerical method to examine the time evolution of the electronic structure and find the multiple carrier generation by electron-electron interaction. Based on our theory, we design a hetero-structured device and successfully show the magnetically controlled photovoltaic effect experimentally. We also study the real-time dynamics of the topological magnetic texture in chiral and dipolar magnets and theoretically develop the design principles of skyrmionic memory devices.

Free Research Field

物性理論