Plasmon modes inN-layer silicene structures.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Nanoscience

Background:

• Silicene, a silicon allotrope analogous to graphene, exhibits unique electronic properties.
• Understanding plasmonics in multilayer silicene is crucial for novel optoelectronic devices.

Purpose of the Study:

• Investigate plasmon properties in N-layer silicene systems under an electric field.
• Analyze the influence of layer number, electric field, spin-orbit coupling, and carrier density on plasmon modes.

Main Methods:

• Utilized the random-phase approximation for theoretical calculations.
• Simulated N-layer silicene systems (N up to 6) with out-of-plane electric fields.
• Incorporated spin-orbit coupling effects.

Main Results:

• Identified N undamped plasmon modes (1 optical, N-1 acoustic).
• Observed increased plasmon frequencies with more layers, exceeding single-layer silicene.
• Found plasmon frequencies decrease with increasing bandgap and imbalanced carrier density.

Conclusions:

• Multilayer silicene exhibits tunable plasmonics with potential for high-frequency applications.
• Plasmon properties are sensitive to layer number, electric field, and carrier distribution.
• Silicene's plasmonics share similarities with graphene under specific conditions.