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

Abstract

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.

arXiv comment14 pages, 16 figures

References in corpus (16)

• Electron spin relaxation by nuclei in semiconductor quantum dots
• Large magnetoresistance in $\pi$-conjugated semiconductor thin film devices
• Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
• Influence of the heterointerface sharpness on exciton recombination dynamics in an ensemble of (In,Al)As/AlAs quantum dots with indirect band-gap
• Spin-flip Raman scattering of the $\Gamma$-X mixed exciton in indirect band-gap (In,Al)As/AlAs quantum dots
• Spin polarization recovery and Hanle effect for charge carriers interacting with nuclear spins in semiconductors
• Spin Inertia of Resident and Photoexcited Carriers in Singly-Charged Quantum Dots
• Optical orientation and alignment of excitons in direct and indirect band gap (In,Al)As/AlAs quantum dots with type-I band alignment
• Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures
• Spin dynamics and magnetic-field-induced polarization of excitons in ultrathin GaAs/AlAs quantum wells with indirect band gap and type-II band alignment
• Nuclear magnetic resonance and nuclear spin relaxation in AlAs quantum well probed by ESR
• Exciton spin decay modified by strong electron-hole exchange interaction
• Nuclear spin dynamics, noise, squeezing and entanglement in box model
• Magnetoresistance in organic semiconductors: including pair correlations in the kinetic equations for hopping transport
• Microscopic theory of OMAR based on kinetic equations for quantum spin correlations
• A solvable quantum model of dynamic nuclear polarization in quantum dots

Cited by in corpus (2)

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