| Full text | |
| Author(s): |
Kawahala, N. M.
[1]
;
Moraes, F. C. D.
[1]
;
Gusev, G. M.
[1]
;
Bakarov, A. K.
[2, 3]
;
Hernandez, F. G. G.
[1]
Total Authors: 5
|
| Affiliation: | [1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil
[2] Novosibirsk State Univ, Novosibirsk 630090 - Russia
[3] Inst Semicond Phys, Novosibirsk 630090 - Russia
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | AIP ADVANCES; v. 10, n. 6 JUN 1 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
Spin transport was studied in a two-dimensional electron gas hosted in a wide GaAs quantum well occupying two subbands. Using space and time Kerr rotation microscopy to image drifting spin packets under an in-plane accelerating electric field, optical injection and detection of spin polarization were achieved in a pump-probe configuration. The experimental data exhibited high spin mobility and long spin lifetimes allowing us to obtain the spin-orbit fields as a function of the spin velocities. Surprisingly, above moderate electric fields of 0.4 V/cm with velocities higher than 2 mu m/ns, we observed a dependence of both bulk and structure-related spin-orbit interactions on the velocity magnitude. A remarkable feature is the increase in the cubic Dresselhaus term to approximately half of the linear coupling when the velocity is raised to 10 mu m/ns. In contrast, the Rashba coupling for both subbands decreases to about half of its value in the same range. These results yield new information on the application of drift models in spin-orbit fields and about limitations for the operation of spin transistors. (AU) | |
| FAPESP's process: | 14/25981-7 - Generating and mapping spin currents with space and time resolution |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support type: | Regular Research Grants |
| FAPESP's process: | 16/50018-1 - Spin noise in two-dimensional electron gases |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| 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 |
| FAPESP's process: | 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures |
| Grantee: | Gennady Gusev |
| Support type: | Research Projects - Thematic Grants |
| 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: | 18/06142-5 - Kerr/Faraday rotation in quantum materials |
| Grantee: | Felix Guillermo Gonzalez Hernandez |
| Support type: | Regular Research Grants |