Borophene molecular plasmons

Abstract

The two-dimensional boron sheet known as borophene is a potential monolayer metal with exceptional optical characteristics. In this work, using time-dependent density functional theory (TDDFT), we examine the optical and plasmonic characteristics of borophene chains. We show that the plasmons in borophene chains are size-dependent and tunable on demand. We identify molecular plasmons based on our analysis of the collectivity of the electron-hole transitions, the transition contribution map, and the dipolar oscillation of the induced charge density. The molecular plasmons in borophene chains open wide possibilities for their applications in next generation optical devices.