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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Two-dimensional (2D) ferroelectricity is a rapidly developing field with significant potential for future electronic applications.
  • Discovering new materials with robust ferroelectric properties is crucial for technological advancement.

Purpose of the Study:

  • To theoretically propose and investigate novel 2D ferroelectric materials.
  • To explore the ferroelectric properties and phase transition mechanisms of single-layer γ-SbX (X = As, P).

Main Methods:

  • First-principles calculations were employed to predict and analyze the electronic and structural properties.
  • Landau theory was utilized to elucidate the ferroelectric phase transition mechanism.

Main Results:

  • Single-layer γ-SbAs and γ-SbP were identified as promising 2D ferroelectric materials.
  • Both materials exhibit significant in-plane spontaneous polarization (3.80 × 10-10 C m-1 for γ-SbAs, 3.47 × 10-10 C m-1 for γ-SbP).
  • Ferroelectricity is maintained at high temperatures (700 K for γ-SbAs, 600 K for γ-SbP), well above room temperature.

Conclusions:

  • Single-layer γ-SbX (X = As, P) are robust ferroelectric materials with high Curie temperatures.
  • These materials hold great promise for applications in nonvolatile memory devices and nanoscale electronics.
  • The study provides fundamental insights into the critical properties of 2D ferroelectric materials.