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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.)

Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet

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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