Articles you may be interested inPower-dependent spin amplification in (In, Ga)As/GaAs quantum well via Pauli blocking by tunnel-coupled quantum dot ensembles Appl. Phys. Lett. 108, 152103 (2016) Time-resolved optical spin orientation spectroscopy was employed to investigate the temperaturedependent electron spin injection in In 0.1 Ga 0.9 As quantum well (QW) and In 0.5 Ga 0.5 As quantum dots (QDs) tunnel-coupled nanostructures with 4, 6, and 8 nm-thick GaAs barriers. The fast picosecond-ranged spin injection from QW to QD excited states (ES) was observed to speed up with temperature, as induced by pronounced longitudinal-optical (LO)-phonon-involved multiple scattering process, which contributes to a thermally stable and almost fully spin-conserving injection within 5-180 K. The LO-phonon coupling was also found to cause accelerated electron spin relaxation of QD ES at elevated temperature, mainly via hyperfine interaction with random nuclear field. V C 2016 AIP Publishing LLC.[http://dx

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