Theoretical study of nuclear spin polarization and depolarization in self-assembled quantum dots

Details Theoretical study of nuclear spin polarization and depolarization in self-assembled quantum dots Theoretical study of nuclear spin polarization and depolarization in self-assembled quantum dots

2010-01-21

arxiv.org/abs/1001.3707v1

Phys. Rev. B 81, 205304 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 13 figures, submitted to Physical Review B

Scientific paper

We investigate how the strain-induced nuclear quadrupole interaction influences the degree of nuclear spin polarization in self-assembled quantum dots. Our calculation shows that the achievable nuclear spin polarization in In_{x}Ga_{1-x}As quantum dots is related to the concentration of indium and the resulting strain distribution in the dots. The interplay between the nuclear quadrupole interaction and Zeeman splitting leads to interesting features in the magnetic field dependence of the nuclear spin polarization. Our results are in qualitative agreement with measured nuclear spin polarization by various experimental groups.

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