Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures

Abstract

We suggest a new spin orientation mechanism for localized electrons: $dynamicelectronspinpolarizationprovidedbynuclearspinfluctuations$. The angular momentum for the electrons is gained from the nuclear spin system via the hyperfine interaction in a weak magnetic field. For this the sample is illuminated by an unpolarized light, which directly polarizes neither the electrons nor the nuclei. We predict, that for the electrons bound in localized excitons 100% spin polarization can be reached in longitudinal magnetic fields of a few millitesla. The proof of principle experiment is performed on momentum-indirect excitons in (In,Al)As/AlAs quantum dots, where in a magnetic field of 17 mT the electron spin polarization of 30% is measured.

arXiv comment6+9 pages, 3+9 figures

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Cited by in corpus (7)

• Hyperfine Structure of Transition Metal Defects in SiC
• Dynamic polarization of electron spins in indirect band gap (In,Al)As/AlAs quantum dots in weak magnetic field: experiment and theory
• Dynamic Valley Polarization in Moire Quantum Dots
• Dynamic spin polarization in organic semiconductors with intermolecular exchange interaction
• Phonon-assisted carrier tunneling in coupled quantum dot systems with hyperfine-induced spin flip
• Electron spin relaxation in X-valley of indirect bandgap AlxGa1-xAs: A new horizon for the realization of next generation spin-photonic devices
• Plasmon to exciton spin conversion in semiconductor-metal hybrid structures