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Selective Substrate-Orbital-Filtering Effect to Realize the Large-Gap Quantum Spin Hall Effect.

Huisheng Zhang1, Yingying Wang1, Wenjia Yang1

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Pristine plumbene has trivial states, but growing it on BaTe surfaces creates a quantum spin Hall phase. This selective orbital filtering mechanism can engineer large-gap topological insulators for advanced electronics.

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Plumbenefirst-principles calculationsquantum spin Hall insulatorsubstrate-orbital-filtering effecttight-bonding model

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Plumbene, a group-IV material analogous to graphene, exhibits strong spin-orbit coupling but possesses topologically trivial electronic states in its pristine form.
  • Topological insulators, particularly quantum spin Hall insulators, are crucial for next-generation electronic devices due to their unique edge transport properties.

Purpose of the Study:

  • To investigate the possibility of inducing topological nontrivial states in plumbene through substrate interaction.
  • To explore methods for enhancing the band gap of quantum spin Hall states in plumbene-based materials.

Main Methods:

  • First-principles calculations were employed to simulate the electronic structure of plumbene grown on different surfaces.
  • Tight-binding model analyses were used to elucidate the orbital contributions and band inversion mechanisms.

Main Results:

  • Epitaxial growth of plumbene on the BaTe(111) surface induces a quantum spin Hall phase with a band gap of approximately 0.3 eV.
  • A selective substrate-orbital-filtering effect, specifically the removal of certain Pb p-orbitals by the BaTe substrate, drives the topological phase transition.
  • Surface adsorption of hydrogen or halogen atoms further increases the band gap to 0.5-0.6 eV by filtering out remaining Pb p-orbitals.

Conclusions:

  • The selective substrate-orbital-filtering mechanism is a viable strategy for creating large-gap quantum spin Hall insulators from heavy-metal-based materials.
  • This approach offers a general pathway to engineer topological properties in 2D materials, with plumbene serving as a promising candidate.
  • Experimental realization of plumbene growth on various substrates suggests the practical feasibility of this method.