Dynamic Polarization of Electron Spins Interacting with Nuclei in Semiconductor Nanostructures
| Autor: | T. S. Shamirzaev, Dmitri R. Yakovlev, Dmitry Smirnov, Manfred Bayer |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
General Physics and Astronomy
FOS: Physical sciences Electron SPIN FLUCTUATIONS 01 natural sciences SEMICONDUCTOR NANOSTRUCTURES 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ELECTRON SPIN POLARIZATION 010306 general physics Spin (physics) Hyperfine structure Circular polarization WEAK MAGNETIC FIELDS Physics Condensed matter physics Spin polarization Condensed Matter - Mesoscale and Nanoscale Physics SPIN POLARIZATION EXCITONS ELECTROSPINNING MAGNETIC FIELDS Polarization (waves) LOCALIZED ELECTRONS Magnetic field ELECTRONS HYPERFINE INTERACTIONS DYNAMIC POLARIZATION MAGNETIC MOMENTS LONGITUDINAL MAGNETIC FIELDS Quantum dot PROOF-OF-PRINCIPLE EXPERIMENTS SEMICONDUCTOR QUANTUM DOTS |
| Zdroj: | Phys Rev Lett Physical Review Letters |
| Popis: | We suggest a new spin orientation mechanism for localized electrons: $dynamic~electron~spin~polarization~provided~by~nuclear~spin~fluctuations$. 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. 6+9 pages, 3+9 figures |
| Databáze: | OpenAIRE |
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