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Optical control of spin-polarized photocurrent in topological insulator thin films

Takeno, Hiroaki ; Saito, Shingo ; Mizoguchi, Kohji

Scientific reports, 2018-10, Vol.8 (1), p.15392-6, Article 15392 [Periódico revisado por pares]

England: Nature Publishing Group

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  • Título:
    Optical control of spin-polarized photocurrent in topological insulator thin films
  • Autor: Takeno, Hiroaki ; Saito, Shingo ; Mizoguchi, Kohji
  • Assuntos: Coexistence ; Crystals ; Electrodes ; Thin films
  • É parte de: Scientific reports, 2018-10, Vol.8 (1), p.15392-6, Article 15392
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Dirac electrons in topological insulators (TIs) provide one possible avenue to achieve control of photocurrents and spin currents without the need to apply external fields by utilizing characteristic spin-momentum locking. However, for TI crystals with electrodes it is actually difficult to characterize the net flow of spin-polarized photocurrents because of the coexistence of surface carriers and bulk carriers generated by optical excitations. We demonstrate here that the net flow directions of spin-polarized photocurrents in TI polycrystalline thin films without electrodes can be precisely and intentionally controlled by the polarization of the excitation pulse alone, which is characterized by performing time-domain terahertz (THz) wave measurements and time-resolved magneto-optical Kerr rotation measurements that are non-contact methods. We show that the amplitudes of s-polarized THz waves radiated from photocurrents under right- and left-circularly polarized excitations are inverted relative to one another. Moreover, we observe the inversion of time-resolved magneto-optical Kerr rotation signals between the two excitations. Our results will open the way as innovative methods to control spin-polarized electrons in optoelectronic and spintronic TI devices without the need to apply external fields.
  • Editor: England: Nature Publishing Group
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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