| Budget Amount *help |
¥45,890,000 (Direct Cost: ¥35,300,000、Indirect Cost: ¥10,590,000)
Fiscal Year 2015: ¥11,960,000 (Direct Cost: ¥9,200,000、Indirect Cost: ¥2,760,000)
Fiscal Year 2014: ¥12,870,000 (Direct Cost: ¥9,900,000、Indirect Cost: ¥2,970,000)
Fiscal Year 2013: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
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| Outline of Final Research Achievements |
The orbital quantization energies and electron energies in self-assembled InAs quantum dots lie in the energy range of terahertz photons. However, since the quantum dots are by far smaller than the terahertz wavelength, the conventional terahertz transmission spectroscopy cannot obtain signals from the quantum dots. In this work, we have developed a novel spectroscopy technique for single quantum dots; we have tightly focused terahertz radiation on a single quantum dot by using the source/drain electrodes of the single quantum dot transistor structure as a terahertz antenna and measured terahertz-induced photocurrent through the quantum dot. From such measurements, we have determined important parameters on the electronic structures of the quantum dots, such as orbital quantization energies and electron charging energies.
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