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Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas

Hernandez, F. G. G. ; Ferreira, G. J. ; Luengo-Kovac, M. ; Sih, V. ; Kawahala, N. M. ; Gusev, G. M. ; Bakarov, A. K.

Physical review. B, 2020-09, Vol.102 (12), p.1, Article 125305 [Periódico revisado por pares]

College Park: American Physical Society

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Título:
Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas
Autor: Hernandez, F. G. G. ; Ferreira, G. J. ; Luengo-Kovac, M. ; Sih, V. ; Kawahala, N. M. ; Gusev, G. M. ; Bakarov, A. K.
Assuntos: Anisotropy ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; Drift ; Electric fields ; Electric potential ; Electron gas ; Electron spin ; Magneto-optical Kerr effect ; Quantum wells ; Relaxation time ; Spin dynamics ; Spin-orbit coupling ; Spintronics ; Time measurement ; Two-dimensional electron gas ; Voltage
É parte de: Physical review. B, 2020-09, Vol.102 (12), p.1, Article 125305
Notas: São Paulo Research Foundation
USDOE Office of Science (SC), Basic Energy Sciences (BES)
SC0016206; 2015/16191-5; 2016/50018-1; 2018/06142-5; 301258/2017-1
Descrição: Spin relaxation was studied in a two-dimensional electron gas confined in a wide GaAs quantum well. Recently, the control of the spin relaxation anisotropy by diffusive motion was first shown in D. Iizasa et al., arXiv:2006.08253. Here, we demonstrate electrical control by drift transport in a system with two subbands occupied. The combined effect of in-plane and gate voltages was investigated using time-resolved Kerr rotation. The measured relaxation time presents strong anisotropy with respect to the transport direction. For an in-plane accelerating electric field along [110] , the lifetime was strongly suppressed irrespective of the applied gate voltage. Remarkably, for transport along [110] , the data shows spin lifetime that was gate dependent and longer than in the [110] direction regardless of the in-plane voltage. In agreement, independent results of anisotropic spin precession frequencies are also presented. Nevertheless, the long spin lifetime, strong anisotropy and drift response seen in the data are beyond the existing models for spin drift and diffusion.
Editor: College Park: American Physical Society
Idioma: Inglês

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Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas

Hernandez, F. G. G. ; Ferreira, G. J. ; Luengo-Kovac, M. ; Sih, V. ; Kawahala, N. M. ; Gusev, G. M. ; Bakarov, A. K.

College Park: American Physical Society

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