Ab initio quantum transport in AB-stacked bilayer penta-silicene using atomic orbitals

Area of Science:

• Condensed Matter Physics
• Materials Science
• Computational Physics

Background:

• Electrical current in materials is microscopically complex, influenced by electron scattering.
• Understanding charge transport is crucial for designing advanced electronic devices.
• Novel silicon allotropes, like penta-silicene, offer potential for improved material properties.

Purpose of the Study:

• To present a parameter-free computational methodology for calculating current density.
• To apply this method to free-standing AB-stacked bilayer penta-silicene.
• To investigate the role of p-orbitals in charge transport within a 3D quantum wire.

Main Methods:

• Utilized first-principles calculations based on density functional theory.
• Employed Wannier functions and scattering matrices for modeling electron transport.
• Visualized current density streamlines to identify regions of high charge flow.

Main Results:

• Successfully calculated parameter-free current density for bilayer penta-silicene.
• Demonstrated the significant role of p-orbitals in the material's transport properties.
• Identified specific locations of maximum charge flow within the quantum wire structure.

Conclusions:

• The developed methodology provides accurate, first-principles insights into material conductivity.
• Bilayer penta-silicene exhibits promising semiconducting properties for electronic applications.
• The computational approach is extensible to more complex physical phenomena in device operation.