Optically controlled spin-polarization memory effect on Mn delta-doped heterostructures.
Autor: | Balanta MA; Instituto de Física 'Gleb Wataghin', Unicamp, 13083-859 Campinas, SP, Brazil.; Departamento de Física, Universidade Federal de São Carlos, CP 676, São Carlos, SP 13565-905, Brazil., Brasil MJ; Instituto de Física 'Gleb Wataghin', Unicamp, 13083-859 Campinas, SP, Brazil., Iikawa F; Instituto de Física 'Gleb Wataghin', Unicamp, 13083-859 Campinas, SP, Brazil., Mendes UC; Instituto de Física 'Gleb Wataghin', Unicamp, 13083-859 Campinas, SP, Brazil.; Laboratoire Pierre Aigrain, École Normale Supérieure-PSL Research University, CNRS, Université Pierre et Marie Curie-Sorbonne Universités, Université Paris Diderot-Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France., Brum JA; Instituto de Física 'Gleb Wataghin', Unicamp, 13083-859 Campinas, SP, Brazil., Danilov YA; Research Institute, State University Nizhny Novgorod, Russia., Dorokhin MV; Research Institute, State University Nizhny Novgorod, Russia., Vikhrova OV; Research Institute, State University Nizhny Novgorod, Russia., Zvonkov BN; Research Institute, State University Nizhny Novgorod, Russia. |
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Jazyk: | angličtina |
Zdroj: | Scientific reports [Sci Rep] 2016 Apr 15; Vol. 6, pp. 24537. Date of Electronic Publication: 2016 Apr 15. |
DOI: | 10.1038/srep24537 |
Abstrakt: | We investigated the dynamics of the interaction between spin-polarized photo-created carriers and Mn ions on InGaAs/GaAs: Mn structures. The carriers are confined in an InGaAs quantum well and the Mn ions come from a Mn delta-layer grown at the GaAs barrier close to the well. Even though the carriers and the Mn ions are spatially separated, the interaction between them is demonstrated by time-resolved spin-polarized photoluminescence measurements. Using a pre-pulse laser excitation with an opposite circular-polarization clearly reduces the polarization degree of the quantum-well emission for samples where a strong magnetic interaction is observed. The results demonstrate that the Mn ions act as a spin-memory that can be optically controlled by the polarization of the photocreated carriers. On the other hand, the spin-polarized Mn ions also affect the spin-polarization of the subsequently created carriers as observed by their spin relaxation time. These effects fade away with increasing time delays between the pulses as well as with increasing temperatures. |
Databáze: | MEDLINE |
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