Electro-mechanical anisotropy of phosphorene

Area of Science:

• Condensed matter physics
• Materials science

Background:

• Uniaxial stress can break material symmetry and alter properties.
• Phosphorene exhibits inherent anisotropy.
• Understanding stress effects is crucial for material applications.

Purpose of the Study:

• Investigate the impact of uniaxial stress on phosphorene's mechanical and electronic properties.
• Explore stress effects along arbitrary directions.
• Quantify the enhancement of phosphorene's anisotropy.

Main Methods:

• First-principles calculations using density functional theory (DFT).
• Computation of mechanical and electronic properties under uniaxial stress.
• Derivation of compact analytical expressions for results.

Main Results:

• Uniaxial stress significantly modifies Young's modulus and Poisson's ratio.
• Stress application alters the band gap and effective carrier masses.
• Anisotropy of phosphorene is demonstrably enhanced under stress.

Conclusions:

• Uniaxial stress is an effective tool for tuning phosphorene's properties.
• The study provides a quantitative understanding of stress-induced anisotropy.
• Results offer valuable insights for designing phosphorene-based devices.