Dynamic polarization of electron spins in indirect band gap (In,Al)As/AlAs quantum dots in a weak magnetic field: Experiment and theory

A novel spin orientation mechanism-dynamic electron spin polarization-has been recently suggested in Phys. Rev. Lett. 125, 156801 (2020). It takes place for unpolarized optical excitation in weak magnetic fields of the order of a few millitesla. In this paper we demonstrate experimentally and theore...

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Bibliographic Details
Published in:Physical review. B 2021-09, Vol.104 (11), p.1, Article 115405
Main Authors: Shamirzaev, T. S., Shumilin, A. V., Smirnov, D. S., Rautert, J., Yakovlev, D. R., Bayer, M.
Format: Article
Language:English
Subjects:
Aluminum arsenides
Electron spin
Electrons
Energy gap
Magnetic fields
Polarization (spin alignment)
Quantum dots
Spin dynamics
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Summary:A novel spin orientation mechanism-dynamic electron spin polarization-has been recently suggested in Phys. Rev. Lett. 125, 156801 (2020). It takes place for unpolarized optical excitation in weak magnetic fields of the order of a few millitesla. In this paper we demonstrate experimentally and theoretically that the dynamic electron spin polarization degree changes sign as a function of time, strength of the applied magnetic field, and its direction. The studies are performed on indirect band-gap (In,Al)As/AlAs quantum dots and their results are explained in the framework of a theoretical model developed for our experimental setting.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.104.115405