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Quantum anomalous Hall effect with higher plateaus.

Jing Wang1, Biao Lian, Haijun Zhang

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|October 15, 2013
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Researchers explored higher plateaus in the quantum anomalous Hall (QAH) effect. They identified a Cr-doped Bi2(Se,Te)3 thin film as a candidate for a C=2 QAH insulator, demonstrating higher magnetic moments lead to higher Hall conductance plateaus.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum phenomena

Background:

  • The quantum anomalous Hall (QAH) effect arises from magnetic order and spin-orbit coupling in topological insulators.
  • Experimental realization of the QAH effect has spurred interest in achieving higher topological plateaus.

Purpose of the Study:

  • To develop a general theory for QAH effect with higher Chern numbers.
  • To identify candidate materials for higher-order QAH insulators.

Main Methods:

  • Theoretical framework development for higher Chern numbers.
  • First-principles calculations for material property prediction.

Main Results:

  • A thin film magnetic topological insulator of Cr-doped Bi2(Se,Te)3 is proposed as a C=2 QAH insulator.
  • Demonstrated that higher magnetic moments correlate with higher Hall conductance plateaus in QAH systems.

Conclusions:

  • The study provides a theoretical basis for higher Chern number QAH states.
  • Cr-doped Bi2(Se,Te)3 thin films are promising candidates for realizing the C=2 QAH effect.