Tunable anisotropic electronic transport in bilayer phosphorene Y-junctions

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanotechnology

Background:

• Bilayer phosphorene exhibits intrinsic anisotropy, making it a candidate for novel electronic devices.
• The electronic properties of bilayer phosphorene are sensitive to external stimuli like electric fields.
• Understanding transport in nanoribbons is crucial for developing nanoscale electronics.

Purpose of the Study:

• To theoretically investigate the electronic transport properties of three-terminal ballistic junctions in bilayer phosphorene nanoribbons.
• To explore the effect of a perpendicular electric field on the electronic structure and transport characteristics.
• To demonstrate the potential of bilayer phosphorene junctions as nanoscale switching devices and logic gates.

Main Methods:

• Theoretical investigation of electronic transport properties.
• Utilizing first-principles calculations and considering different nanoribbon edge terminations (armchair, zigzag).
• Analyzing the impact of a uniform perpendicular electric field on band structure and conductance.

Main Results:

• Bilayer phosphorene exhibits a semiconductor-to-metal transition under an electric field, unlike bilayer graphene.
• The electric field effectively modulates current flow in Y-junctions, allowing redirection to output terminals.
• Different junction constituents influence electron conductance and probability density, interpretable via dispersion relations.

Conclusions:

• Bilayer phosphorene nanoribbon junctions can function as nanoscale switches.
• The electric-field-induced modulation enables the development of phosphorene-based logic gates with high on/off ratios.
• The material's high carrier mobility further enhances its potential for advanced electronic applications.