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Haldar_Rev_manuscript.pdf (4.74 MB)

Microscopic Theory of Plasmons in Substrate-Supported Borophene

preprint
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.


History

Email Address of Submitting Author

ssharifz@bu.edu

Institution

Boston University

Country

USA

ORCID For Submitting Author

0000-0003-4215-4668

Declaration of Conflict of Interest

None

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