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Related Experiment Video

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Magnetic Second-Order Topological Insulators in 2H-Transition Metal Dichalcogenides.

Guodong Liu1,2, Haoqian Jiang1,2, Zhenzhou Guo1,2

  • 1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin, 300130, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 30, 2023
PubMed
Summary

Two-dimensional ferromagnetic materials, 2H-VX2, are identified as second-order topological insulators (SOTI). These materials exhibit robust, spin-polarized corner states with fractional charges, ideal for experimental detection.

Keywords:
2D materialferromagnetichigher order topological insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Chemistry

Background:

  • Two-dimensional materials offer unique electronic properties.
  • Topological insulators possess protected surface states.
  • Second-order topological insulators (SOTI) exhibit topological states at lower dimensions.

Purpose of the Study:

  • To identify novel two-dimensional materials exhibiting SOTI properties.
  • To investigate the characteristics of topological corner states in these materials.
  • To assess the robustness and experimental feasibility of SOTI properties in 2H-VX2.

Main Methods:

  • First-principles calculations were employed to investigate the electronic structure of 2H-VX2 (X = S, Se, Te).
  • Band gap analysis in spin channels was performed.
  • Topological properties and corner state characteristics were theoretically analyzed.

Main Results:

  • 2H-VX2 (X = S, Se, Te) materials were identified as ferromagnetic SOTIs.
  • A nontrivial band gap was found in two spin channels.
  • Topologically protected, spin-polarized corner states with quantized fractional charge (e/3) were discovered.
  • These corner states are localized at the nanodisk geometry edges and robust against perturbations.
  • SOTI properties remain stable with spin-orbit coupling and magnetization.

Conclusions:

  • 2H-VX2 (X = S, Se, Te) are promising platforms for exploring magnetic SOTI.
  • The robust corner states suggest significant potential for experimental detection.
  • These findings open new avenues for topological quantum technologies.