| Full text | |
| Author(s): |
Ullah, S.
;
Gusev, G. M.
;
Bakarov, A. K.
;
Hernandez, F. G. G.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Journal of Applied Physics; v. 121, n. 20 MAY 28 2017. |
| Web of Science Citations: | 3 |
| Abstract | |
We have studied the spin dynamics of a dense two-dimensional electron gas confined in a GaAs/AlGaAs triple quantum well by using time-resolved Kerr rotation and resonant spin amplification. Strong anisotropy of the spin relaxation time up to a factor of 10 was found between the electron spins oriented in-plane and out-of-plane when the excitation energy is tuned to an exciton bound to neutral donor transition. We model this anisotropy using an internal magnetic field and the inhomogeneity of the electron g-factor. The data analysis allows us to determine the direction and magnitude of this internal field in the range of a few mT for our studied structure, which decreases with the sample temperature and optical power. The dependence of the anisotropic spin relaxation was directly measured as a function of several experimental parameters: excitation wavelength, sample temperature, pump-probe time delay, and pump power. Published by AIP Publishing. (AU) | |
| 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: | 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures |
| Grantee: | Gennady Gusev |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 09/15007-5 - Magnetic dynamics in semiconductor nanocrystals |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 14/25981-7 - Generating and mapping spin currents with space and time resolution |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support Opportunities: | Regular Research Grants |