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Designing edge states from fractional polarization insulators.

Wei Jie Chan1, Pei-Hao Fu1, L K Ang1

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We explored topological edge states in anisotropic honeycomb lattices. Disrupting symmetry in fractional polarization insulators engineers these states, enabling new device applications.

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Area of Science:

  • Condensed Matter Physics
  • Topological Materials Science

Background:

  • Anisotropic honeycomb lattices lack chiral symmetry.
  • Fractional polarization (FP) insulators possess robust topological edge states (TES).

Purpose of the Study:

  • Investigate theoretically disconnected dispersive edge states.
  • Explore engineering of TES by symmetry disruption.
  • Analyze finite-size effects on edge state configurations.

Main Methods:

  • Theoretical investigation of lattice models.
  • Analysis of symmetry-breaking terms.
  • Examination of finite-size effects.

Main Results:

  • Engineered dispersive edge states by breaking mirror or chiral symmetry.
  • Achieved disconnected helical-like and chiral-like edge states via finite-size effects.
  • Demonstrated manipulation of edge states in FP insulators.

Conclusions:

  • Symmetry disruption and finite-size effects offer pathways to engineer topological edge states.
  • Potential for novel devices utilizing topological domain walls.