| Budget Amount *help |
¥40,560,000 (Direct Cost: ¥31,200,000、Indirect Cost: ¥9,360,000)
Fiscal Year 2016: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2015: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2014: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2013: ¥29,380,000 (Direct Cost: ¥22,600,000、Indirect Cost: ¥6,780,000)
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| Outline of Final Research Achievements |
In this research project, we aimed to establish the methods for optical engineering of nuclear spins in a single quantum dot structure. The following experimental achievements are especially important;
1. Even without any external magnetic field, the positive trion excited by the circularly-polarized light generated an Overhauser field of up to 0.8 T. From the excitation power dependences of the Overhauser field and degree of circular polarization of the photoluminescence spectra, the relation between the Overhauser field and Knight field under zero external magnetic field was revealed clearly.
2. we found a gradual reduction by almost one-order of the nuclear depolarization rate by increasing the longitudinal magnetic field up to 1 T. The change in the nuclear depolarization rate seemed to be related to the quadrupolar interaction with the tilted principal axis, and this observation can be interpreted as the restoring of the eigenaxis of nuclear spin.
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