2022 Fiscal Year Final Research Report
Subcycle observation of spin-dependent transport under intense mid-infrared electric field transient
| Project/Area Number |
20K22478
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0402:Nano/micro science, applied condensed matter physics, applied physics and engineering, and related fields
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2020-09-11 – 2023-03-31
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| Keywords | 中赤外 / パラメトリック増幅 / 光源開発 / スピンホール効果 / テラヘルツ |
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| Outline of Final Research Achievements |
In this work, we have developed n infrared light source with a very high amplitude- and phase stability that is suitable for future applications in the high-field effect in correlated materials. By employing the Yb:KGW laser as a pump source and parametrically amplifying the carrier-envelope phase locked seed pulses generated by the inline difference frequency mixing, we generated the few-cycle mid infrared transients around 2 um with approximately 2 cycle pulse duration and tens of microjoule output power at 100 kHz. Additionally, we revealed a spin-dependent transport dynamics of a photoexcited carrier by circularly polarized optical pump-terahertz polarization spectroscopy.
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| Free Research Field |
超高速科学
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| Academic Significance and Societal Importance of the Research Achievements |
高強度光電場下で生じる様々な非線形電子応答は物質の特性を観察・制御するために欠かせない手法となりつつあり，電子デバイスや材料開発にとって重要な知見を与える。そうしたダイナミクスを非常に感度よく検出するためには光源の安定性が欠かせない。今回確立したレーザー光源は同種の光源としては最高レベルの安定性を持ち，将来的には様々な物質系における非線形応答の精密測定に応用できると考えられる。
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