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Haldar_Rev_manuscript.pdf (4.74 MB)

Microscopic Theory of Plasmons in Substrate-Supported Borophene

submitted on 14.03.2020, 00:17 and posted on 16.03.2020, 11:48 by Anubhab Haldar, Cristian Cortes, Pierre Darancet, Sahar SHARIFZADEH

We compute the dielectric properties of freestanding and metal-supported borophene from first-principles time-dependent density functional theory. We find that both the low- and high-energy plasmons of borophene are fully quenched by the presence of a metallic substrate at borophene-metal distances smaller than $\simeq$ 9 \AA. Based on these findings, we derive an electrodynamic model of the interacting, momentum-dependent polarizability for a two-dimensional metal on a model metallic substrate, which quantitatively captures the evolution of the dielectric properties of borophene as a function of metal-borophene distance. Applying this model to a series of metallic substrates, we show that maximizing the plasmon energy detuning between borophene and substrate is the key material descriptor for plasmonic performance.


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Boston University



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Declaration of Conflict of Interest



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