Plasmonic features of a hybrid system comprising borophene and aluminium

Abstract

Due to their intriguing light–matter interactions at the nanoscale, hybrid systems made up of dissimilar elements are currently receiving a lot of attention. In this study, we systematically examine the optical and plasmonic properties of a hybrid system made of borophene and Aluminium (Al) film using first-principles time-dependent density functional theory calculations. We discovered that, despite the weak charge transfer between the constituent systems, the borophene plasmon is totally quenched or damped by the proximity to the Al film for a gap distance (d) below 9 Å, and the Al plasmon dominates the optical response. When the d value is raised to 9 Å and higher, the borophene plasmon starts to reemerge. This finding is consistent with earlier finding on graphene on metallic film, which demonstrated that the graphene plasmons are quenched by the metallic film’s proximity and recovered at high d values.