Spin-flip transitions induced by time-dependent electric fields in surfaces with strong spin-orbit interaction.

نویسندگان

  • Julen Ibañez-Azpiroz
  • Asier Eiguren
  • E Ya Sherman
  • Aitor Bergara
چکیده

We present a comprehensive theoretical investigation of the light absorption rate at a Pb/Ge(111)-β√3 × √3R30° surface with strong spin-orbit coupling. Our calculations show that electron spin-flip transitions cause as much as 6% of the total light absorption, representing 1 order of magnitude enhancement over Rashba-like systems. Thus, we demonstrate that a substantial part of the light irradiating this nominally nonmagnetic surface is attenuated in spin-flip processes. Remarkably, the spin-flip transition probability is structured in well-defined hot spots within the Brillouin zone, where the electron spin experiences a sudden 90° rotation. This mechanism offers the possibility of an experimental approach to the spin-orbit phenomena by optical means.

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عنوان ژورنال:
  • Physical review letters

دوره 109 15  شماره 

صفحات  -

تاریخ انتشار 2012