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

N. M. Kawahala, F. C.D. Moraes, G. M. Gusev, A. K. Bakarov, F. G.G. Hernandez

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1 Citation (Scopus)

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 μm/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 μm/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.

Original languageEnglish
Article number065232
Number of pages5
JournalAIP Advances
Volume10
Issue number6
DOIs
Publication statusPublished - 1 Jun 2020

Keywords

  • SPINTRONICS

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