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Trigonal multivalent polonium monolayers with intrinsic quantum spin Hall effects.

Hairui Bao1, Bao Zhao1,2, Jiayong Zhang3

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Poloniumene, a 2D material, exhibits unique multivalent behavior and a large band gap, functioning as a quantum spin Hall insulator. This discovery advances research into novel 2D topological insulators.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Electronics

Background:

  • Two-dimensional (2D) topological insulators possess extraordinary quantum electronic states, attracting significant research interest.
  • The experimental fabrication of 2D tellurene has spurred investigations into group-VI monolayer materials.

Purpose of the Study:

  • To investigate the structures and electronic states of 2D polonium (poloniumene) using first-principles calculations and a tight-binding (TB) method.
  • To explore the potential of poloniumene as a stable 2D topological insulator.

Main Methods:

  • First-principles calculations.
  • Tight-binding (TB) model.
  • Exploration of congener element doping.

Main Results:

  • Poloniumene forms a stable, three-atomic-layer 1T-MoS2-like structure (trigonal poloniumene).
  • It exhibits multivalent behavior: central Po atoms are metal-like, outer atoms are semiconductor-like.
  • Poloniumene is identified as an intrinsic quantum spin Hall insulator with a large band gap due to band inversion.

Conclusions:

  • The unique structure and multivalent behavior contribute to poloniumene's stability and topological properties.
  • Poloniumene represents a promising new material for 2D topological insulator applications.
  • Further exploration of doped poloniumene could yield tunable electronic properties.