Imaging trions and their dynamics in momentum space

• Project/Area Number: 23K25807
• Project/Area Number (Other): 23H01110 (2023)
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Multi-year Fund (2024); Single-year Grants (2023)
• Section: 一般
• Review Section: Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
• Research Institution: Okinawa Institute of Science and Technology Graduate University
• Principal Investigator: Dani Keshav 沖縄科学技術大学院大学, フェムト秒分光法ユニット, 教授 (80630946)
• Project Period (FY): 2023-04-01 – 2026-03-31
• Project Status: Granted (Fiscal Year 2024)
• Budget Amount: ¥18,980,000 (Direct Cost: ¥14,600,000、Indirect Cost: ¥4,380,000); Fiscal Year 2025: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2024: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2023: ¥9,360,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥2,160,000)
• Keywords: time-resolved ARPES / 2D semiconductors / momentum microscopy / trions / excitons / Time-resolved ARPES / Momentum microscopy

Outline of Research at the Start

1.Sample Preparation:First, to measure the trionic states, in FY23 we have prepared high-quality, gated samples that exhibit very low sample inhomogeneity and can be tuned to the trionic regime.　2.Imaging the Trionic Wavefunction:In FY24, we will measure the trion wavefunction in our TR-XUV-u-ARPES instrumentation that has been developed at OIST over the past decade. 3.Dynamics of the Trion: Finally, in FY25, by varying the time-delay between the photoexciting pump pulse and the probe pulse, we will be able to visualize the formation, scattering and decay of the photoexcited trion states.