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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Resonant optical control of the electrically induced spin polarization by periodic excitation

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Hernandez, F. G. G. [1] ; Gusev, G. M. [1] ; Bakarov, A. K. [2, 3]
Total Authors: 3
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo - Brazil
[2] Russian Acad Sci, Inst Semicond Phys, Novosibirsk 630090 - Russia
[3] Novosibirsk State Univ, Novosibirsk 630090 - Russia
Total Affiliations: 3
Document type: Journal article
Source: Physical Review B; v. 90, n. 4 JUL 14 2014.
Web of Science Citations: 7

We show that the electron spin polarization generated by an electrical current may have its direction controlled and magnitude amplified by periodic optical excitation. The electrical and optical spin control methods were combined and implemented in a two-dimensional electron gas. By Kerr rotation in an external transverse magnetic field, we demonstrate unexpected long-lived coherent spin oscillations of the current-induced signal in a system with large spin-orbit interaction. Using a single linearly polarized pulse for spin manipulation and detection, we found a strong dependence on the pulse optical power and sample temperature indicating the relevance of the hole spin in the electron spin initialization. The signal was mapped in a Hall bar as function of the position relative to the injection contact. Finally, the presence of an in-plane spin polarization was directly verified by rotating the experimental geometry. (AU)

FAPESP's process: 13/03450-7 - The spin Hall effect in semiconductors
Grantee:Felix Guillermo Gonzalez Hernandez
Support type: Regular Research Grants
FAPESP's process: 10/09880-5 - The spin Hall effect in wide and double quantum wells
Grantee:Gennady Gusev
Support type: Regular Research Grants
FAPESP's process: 09/15007-5 - Magnetic dynamics in semiconductor nanocrystals
Grantee:Felix Guillermo Gonzalez Hernandez
Support type: Regular Research Grants