Two-dimensional tricycle arsenene with a direct band gap

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Two-dimensional (2D) materials offer unique electronic and mechanical properties.
• Various structural phases of arsenene have been theoretically investigated.
• Understanding the stability and electronic properties of different arsenene phases is crucial for their application.

Purpose of the Study:

• To investigate the stability and electronic properties of two-dimensional tricycle-shaped arsenene (T-As).
• To compare the stability of T-As with other reported arsenene phases (chair-shaped C-As and stirrup-shaped S-As).
• To explore the potential applications of T-As in nano-electronics and nano-devices.

Main Methods:

• Comprehensive theoretical investigation using ab initio phonon calculations.
• Finite-temperature molecular dynamics simulations to assess thermal stability.
• Analysis of electronic band structure to determine band gap properties.

Main Results:

• Two-dimensional tricycle-shaped arsenene (T-As) is found to be robust and stable even at high temperatures.
• T-As exhibits energetic stability comparable to C-As and superior to S-As.
• Monolayer T-As is a direct band gap semiconductor with a calculated energy gap of 1.377 eV.
• The electronic structure of T-As can be tuned via stacking, strain, and patterning.
• Functionalization with H or F atoms allows for the creation of T-As nanoribbons with controlled edge types and widths.

Conclusions:

• T-As is a promising 2D material with significant thermal stability.
• Its direct band gap and tunable electronic properties make it suitable for future nano-electronic applications.
• The ability to form controlled nanoribbons opens avenues for nano-device fabrication.