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Atomic Nuclei: Nuclear Spin State Overview

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Measurable spin-polarized current in two-dimensional topological insulators.

Xing-Tao An1, Yan-Yang Zhang, Jian-Jun Liu

  • 1SKLSM, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, People's Republic of China. anxingtao@semi.ac.cn

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 23, 2012
PubMed
Summary

We present a simple method to generate spin-polarized currents in two-dimensional topological insulators using magnetic impurities. This approach creates a robust, single-edge current insensitive to non-magnetic disorder.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Two-dimensional topological insulators possess unique edge states protected by time-reversal symmetry.
  • Generating spin-polarized currents is crucial for spintronic applications.
  • Existing methods often lack robustness or are model-specific.

Purpose of the Study:

  • To propose a simple and generalizable method for creating spin-polarized currents in two-dimensional topological insulators.
  • To investigate the robustness of the generated spin-polarized current against disorder.
  • To demonstrate the applicability of the method to various topological insulator systems.

Main Methods:

  • Utilizing the Kane-Mele model with z-component magnetic impurities on one edge.
  • Analyzing the opening of a subgap in edge states while preserving other gapless edge states.
  • Calculating the conductance plateau value to confirm single-edge, spin-polarized current.

Main Results:

  • A subgap is opened in specific edge states by magnetic impurities, leading to a conductance plateau of e^2/h.
  • A single-edge, spin-polarized current is generated and protected by time-reversal symmetry.
  • The spin-polarized current exhibits robustness against weak non-magnetic disorder.

Conclusions:

  • The proposed method offers a straightforward way to generate robust spin-polarized currents in two-dimensional topological insulators.
  • This mechanism is independent of the specific theoretical model and applicable to systems like HgTe/CdTe quantum wells and silicene nanoribbons.
  • The findings pave the way for practical spintronic devices based on topological insulators.