Magnetic dynamics in semiconductor nanocrystals

• Grant number: 09/15007-5
• Support type: Regular Research Grants
• Duration: January 01, 2010 - June 30, 2012
• Field of knowledge: Physical Sciences and Mathematics - Physics
• Principal Investigator: Felix Guillermo Gonzalez Hernandez
• Grantee: Felix Guillermo Gonzalez Hernandez
• Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The assessment of the magnetic properties in epitaxial semiconductor nanostructures is intended with this work, more specifically self-assembled quantum dots (SAQDs) doped with electrons and magnetic impurities. This project defines a new research line at DFMC/IFUSP devoted to the study of the spin dynamics for carriers confined in nanostructures. The considered experiments intent to use time-resolved magneto-optical spectroscopy (Kerr and Faraday effect TRKR/TRFR) and optical continuous-wave measurements (photoluminescence PL and excitation photoluminescence PLE), complemented with electric measurements (capacitance-voltage C-V, current-voltage I-V, Hall effect and Shubnikov de Haas). With the acquisition of the requested equipment, the implementation of these techniques will allow the study of basic parameters for the practical implementation of spintronic devices in solid state. Specifically, the project involves aspects of great interest: a) study of the electronic spin polarization dynamics for different loading conditions in semiconductor InAs/GaAs and InP/GaAs quantum dots and AlGaAs wells, b) study of the magnetic impurities (Mn) in the optic properties of quantum dots and through the mapping of the Landé g-factor measured by capacitance-voltage. (AU)

Scientific publications

(8)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ULLAH, S.; GUSEV, G. M.; BAKAROV, A. K.; HERNANDEZ, F. G. G. Tailoring multilayer quantum wells for spin devices. PRAMANA-JOURNAL OF PHYSICS, v. 91, n. 3 SEP 2018. Web of Science Citations: 0.

ULLAH, S.; MORAES, F. C. D.; GUSEV, G. M.; BAKAROV, A. K.; HERNANDEZ, F. G. G. Robustness of spin polarization against temperature in multilayer structure: Triple quantum well. Journal of Applied Physics, v. 123, n. 21 JUN 7 2018. Web of Science Citations: 0.

LUENGO-KOVAC, M.; MORAES, F. C. D.; FERREIRA, G. J.; RIBEIRO, A. S. L.; GUSEV, G. M.; BAKAROV, A. K.; SIH, V.; HERNANDEZ, F. G. G. Gate control of the spin mobility through the modification of the spin-orbit interaction in two-dimensional systems. Physical Review B, v. 95, n. 24 JUN 30 2017. Web of Science Citations: 3.

ULLAH, S.; GUSEV, G. M.; BAKAROV, A. K.; HERNANDEZ, F. G. G. Large anisotropic spin relaxation time of exciton bound to donor states in triple quantum wells. Journal of Applied Physics, v. 121, n. 20 MAY 28 2017. Web of Science Citations: 3.

HERNANDEZ, F. G. G.; ULLAH, S.; FERREIRA, G. J.; KAWAHALA, N. M.; GUSEV, G. M.; BAKAROV, A. K. Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases. Physical Review B, v. 94, n. 4 JUL 14 2016. Web of Science Citations: 6.

ULLAH, S.; GUSEV, G. M.; BAKAROV, A. K.; HERNANDEZ, F. G. G. Long-lived nanosecond spin coherence in high-mobility 2DEGs confined in double and triple quantum wells. Journal of Applied Physics, v. 119, n. 21 JUN 7 2016. Web of Science Citations: 8.

HERNANDEZ, F. G. G.; GUSEV, G. M.; BAKAROV, A. K. Resonant optical control of the electrically induced spin polarization by periodic excitation. Physical Review B, v. 90, n. 4 JUL 14 2014. Web of Science Citations: 7.

HERNANDEZ, F. G. G.; NUNES, L. M.; GUSEV, G. M.; BAKAROV, A. K. Observation of the intrinsic spin Hall effect in a two-dimensional electron gas. Physical Review B, v. 88, n. 16 OCT 29 2013. Web of Science Citations: 19.