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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW B; v. 102, n. 12, p. 7-pg., 2020-09-15.

Resumo

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 [1 (1) over bar0], 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. (AU)

• Processo FAPESP: 18/06142-5 - Rotação de Kerr/Faraday em materiais quânticos
• Beneficiário: Felix Guillermo Gonzalez Hernandez
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 15/16191-5 - Pesquisas em novos materiais envolvendo campos magnéticos intensos e baixas temperaturas
• Beneficiário: Gennady Gusev
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 16/50018-1 - Spin noise in two-dimensional electron gases
• Beneficiário: Felix Guillermo Gonzalez Hernandez
• Modalidade de apoio: Auxílio à Pesquisa - Regular