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Two-dimensional Dirac fermions on oxidized black phosphorus.

Seoung-Hun Kang1, Jejune Park, Sungjong Woo

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This study reveals that black phosphorus naturally oxidizes, forming stable phosphorene oxides. Infrared spectroscopy can determine the oxidation degree, and fully oxidized phosphorene exhibits unique Dirac semimetal properties.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Black phosphorus, a single layer of phosphorus, is a 2D material with unique electronic properties.
  • Understanding the oxidation of 2D materials is crucial for their stability and application.
  • Phosphorene oxides (POx) are of interest due to potential modifications in electronic and optical properties.

Purpose of the Study:

  • To investigate the equilibrium structures and stability of phosphorene oxides (POx) with varying oxygen concentrations.
  • To explore the impact of oxidation on the electronic and vibrational properties of phosphorene.
  • To identify potential applications of oxidized phosphorene, particularly its semimetal characteristics.

Main Methods:

  • Ab initio density functional theory (DFT) calculations were employed.
  • Formation energies and vibrational properties were evaluated for various oxygen concentrations (x).
  • Electronic band structures of pristine and oxidized phosphorene were analyzed.

Main Results:

  • Stable phosphorene oxide structures (POx) were identified, confirming natural oxidation.
  • Oxidation induces IR-active modes related to P-O and P-P bonds, enabling oxidation degree determination via infrared spectra.
  • Fully oxidized phosphorene (PO) exhibits a direct band gap of 0.83 eV and possesses unique symmetry-protected band structures with four-fold degenerate Dirac points.

Conclusions:

  • Oxidation is a natural process for phosphorene, leading to stable POx structures.
  • Infrared spectroscopy can serve as a tool to quantify the oxidation level of phosphorene.
  • The discovered Dirac semimetal properties of fully oxidized phosphorene offer new avenues for exploring topological electronic states and advanced material applications.