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Detailed Measurements of Nuclear Spin Polarizations in a Single InAlAs Quantum Dot Through Overhauser Shift of Photoluminescence |
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| Authors: | R Kaji S Adachi H Sasakura S Muto H Kumano I Suemune |
| Affiliation: | (1) Department of Applied Physics, Hokkaido University, N13 W8, Kitaku, Sapporo 060-8628, Japan;(2) CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan;(3) Research Institute of Electronic Science, Hokkaido University, Sapporo 001-0021, Japan |
| Abstract: | We investigated optical pumping of nuclear spin polarizations in a single self-assembled In0.75Al0.25As/Al0.3Ga0.7As quantum dot. The nuclear spin polarization exhibits the abrupt jump and hysteresis in the excitation power dependence at a particular excitation polarization. Measurement of circular polarization rate of the photoluminescence reveals that the abrupt change of the nuclear spin polarization is created mainly by the spin flip-flop process between nuclei and an electron of a positive charged exciton in this single quantum dot. Model calculation explains well the experimentally observed bistable behavior in InAlAs quantum dot. By using this abrupt change, the sign and magnitude of electron and hole g-factors in z-direction are verified. |
| Keywords: | Zeeman splitting Exciton Quantum dots Hyperfine interaction |
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