The effect of perpendicular electric field on Temperature-induced plasmon excitations for intrinsic silicene

TL;DR

This study investigates how a perpendicular electric field influences temperature-induced plasmon excitations in intrinsic silicene, revealing tunable plasmon properties that could enhance plasmonic device applications.

Contribution

It demonstrates the electric field's role in tuning plasmon spectra and damping in silicene at finite temperatures, using the tight-binding model and RPA.

Findings

Electric field modulates plasmon existence range.

A low damped zone is created by spin splitting.

Plasmon intensity and bandwidth are highly tunable.

Abstract

We use the tight-binding model and the random-phase approximation to investigate the intrinsic plasmon in silicene. At finite temperatures, an undamped plasmon is generated from the interplay between the intraband and the interband-gap transitions. The extent of the plasmon existence range in terms of momentum and temperature, which is dependent on the size of single-particle-excitation gap, is further tuned by applying a perpendicular electric field. The plasmon becomes damped in the interband-excitation region. A low damped zone is created by the field-induced spin split. The field-dependent plasmon spectrum shows a strong tunability in plasmon intensity and spectral bandwidth. This could make silicene a very suitable candidate for plasmonic applications.