| Full text | |
| Author(s): |
Hernandez, F. G. G.
;
Gusev, G. M.
;
Bakarov, A. K.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Physical Review B; v. 90, n. 4, p. 5-pg., 2014-07-14. |
| Abstract | |
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: | 09/15007-5 - Magnetic dynamics in semiconductor nanocrystals |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 13/03450-7 - The spin Hall effect in semiconductors |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 10/09880-5 - The spin Hall effect in wide and double quantum wells |
| Grantee: | Gennady Gusev |
| Support Opportunities: | Regular Research Grants |