| Budget Amount *help |
¥37,830,000 (Direct Cost: ¥29,100,000、Indirect Cost: ¥8,730,000)
Fiscal Year 2017: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2016: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2015: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2014: ¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
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| Outline of Final Research Achievements |
We realized mid-infrared absorption imaging of paraexcitons in cuprous oxide crystal at a temperature of 64 mK via the application of a dilution refrigerator. We observed a Bose-Einstein condensate of paraexcitons below 400 mK by visualizing the exciton cloud in real space using absorption imaging. We also extracted the lifetime, mobility, and diffusion constant of trapped paraexcitons below 1 K from measurements of space- and time-resolved luminescence spectra of paraexcitons.
Furthermore, we constructed a system for laser-based angle-resolved photoelectron spectroscopy (ARPES) using a time-of-flight (ToF) electron analyzer. We also achieved the highest energy resolution of ARPES using the ToF analyzer. The high yield of our analyzer enabled us to observe photo-excited states of topological insulators and semiconductors.
We also succeeded in evaluating the carrier density of Fermi-degenerate electron-hole droplets by measuring mid-infrared dielectric response and ultraviolet emission.
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