| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2013: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
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| Outline of Final Research Achievements |
We developed the magneto-optical Kerr rotation imaging system operating below 0.5 K by using dilution refrigerator to investigate the electron spin polarization in quantum Hall (QH) regime. The dynamic nuclear polarization (DNP) by the QH breakdown current and the dynamics of DNP relaxation were studied by means of the spatial and time resolved Kerr rotation measurements. The spatial pattern of the QH breakdown current can be imaged as a DNP distribution profile. We also investigated the electron spin polarization in GaAs/AlGaAs HEMT structures, where the extent of Kerr rotation angle is negligibly smaller than that in the quantum well structures, by using Sagnac interferometer. We confirmed the electron spin polarization at the filling factor 3 can be evaluated by the Kerr rotation measurement with the electron density modulation. We also studied the electron transport near the edge channels in QH regime under the optical vortex irradiation.
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