Quadrupolar effect on nuclear spin depolarization in single self-assembled quantum dots

We investigate the nuclear spin polarization in single self-assembled InAlAs quantum dots under magnetic fields that are sufficiently weak to make the impacts of the quadrupole interaction apparent. The nuclear spin depolarization rate decreases as the magnitude of the applied longitudinal magnetic...

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Bibliographic Details
Published inApplied physics express Vol. 11; no. 8; pp. 85201 - 85205
Main Authors Matsusaki, Ryosuke, Kaji, Reina, Yamamoto, Sota, Sasakura, Hirotaka, Adachi, Satoru
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.08.2018
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Summary:We investigate the nuclear spin polarization in single self-assembled InAlAs quantum dots under magnetic fields that are sufficiently weak to make the impacts of the quadrupole interaction apparent. The nuclear spin depolarization rate decreases as the magnitude of the applied longitudinal magnetic field increases. This trend can be explained by the dissolution of quadrupolar mixing that is coupled to the temporal fluctuations of the hyperfine interaction. In addition, the optically injected electron spin generates a considerable Overhauser field under a wide range of experimental conditions. These findings are important for nuclear spin engineering and electron spin manipulation in self-assembled III-V semiconductor quantum dots.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.11.085201