Edge absorption and pure spin current in a 2D topological insulator in the Volkov-Pankratov model

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Abstract

Light absorption due to transitions between the edge and two-dimensional (2D) states of a 2D topological insulator (TI) is considered in the Volkov-Pankratov model. It is shown that the transitions are allowed only for the in-plane electric field orthogonal to the TI edge. It is found that the absorption is accompanied by pure spin photocurrent along the TI edge. A possibility of spin current measurement using polarized luminescence from 2D TI quantum dots is discussed.

Original languageEnglish
Article number435303
Number of pages5
JournalJournal of Physics Condensed Matter
Volume29
Issue number43
DOIs
Publication statusPublished - 27 Sep 2017

Keywords

  • 2D topological insulator
  • Edge states
  • Light absorption
  • Pure spin current
  • SUPERCONDUCTIVITY
  • pure spin current
  • light absorption
  • STATE
  • edge states

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