| Project/Area Number |
22K13991
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | The University of Tokyo (2023)
National Institutes for Quantum Science and Technology (2022) |
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Principal Investigator |
Hashmi Arqum 東京大学, 大学院工学系研究科(工学部), 特任研究員 (90815325)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2023: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2022: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | Ultrafast / TDDFT / Nonlinear optics / Spin-orbit coupling / femtosecond / Spin-orbit interactions / 2D material / Time dependent DFT / Spintronics / Valleytronics / Ultrafast dynamics |
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| Outline of Research at the Start |
The characteristics and applications of 2D materials with ultrashort pulses are quite diverse in the presence of strong spin-orbit coupling (SOC). In this regard, a comprehensive theoretical and computational study for the explanation of the light-matter interaction in 2D materials with strong SOC is in urgent need. The formalism of TDDFT with Maxwell equations which is considered a benchmark in optical studies will be employed to study the ultrafast charge and spin dynamics. Here, by using the different levels of theory we will explore the various aspects of electron dynamics in 2D materials.
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| Outline of Final Research Achievements |
Owing to their extraordinary physical properties, 2D monolayers have become an emerging field, featuring strong light-matter interactions and ultrafast broadband optical responses. A comprehensive computational framework to explore and explain the different aspects of ultrafast dynamics is urgently needed.
To address this, we used the formalism of TDDFT with Maxwell equations as a benchmark to study ultrafast time-dependent electron dynamics. By incorporating spin-orbit couplings, our study explores various aspects of electron dynamics in 2D materials. We examined 2D semiconductors and semimetals, which can control electron dynamics on the sub-femtosecond timescale, faster than electron-electron (tens of fs) and electron-phonon scattering (hundreds of fs). We found the possibility to control carrier dynamics up to the femtosecond timescale through ultrashort pulses and explored spintronics at the femtosecond scale, opening opportunities for extremely fast information processing.
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| Academic Significance and Societal Importance of the Research Achievements |
The scientific importance of this research is about understanding how electrons move really fast. It helps us learn how materials behave when interact with light. This can be useful for making new technologies like faster computers and communication devices and improved ways to store information.
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