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Microscopic Theory of Plasmons in Substrate-Supported Borophene
Anubhab Haldar1, Cristian L Cortes2, Pierre Darancet2,3
1Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, United States.
Nano Letters
|March 27, 2020
Summary
The dielectric properties of borophene are significantly altered by metallic substrates, quenching its plasmons. Optimizing plasmonic performance requires maximizing the energy detuning between borophene and the substrate.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- Borophene, a 2D material, exhibits unique electronic and plasmonic properties.
- Understanding the influence of substrates on 2D material properties is crucial for device applications.
Purpose of the Study:
- To compute the dielectric properties of freestanding and metal-supported borophene.
- To investigate the effect of metallic substrates on borophene plasmons.
- To develop a model for predicting plasmonic performance.
Main Methods:
- First-principles time-dependent density functional theory (TD-DFT) calculations.
- Derivation of an electrodynamic model for 2D metals on substrates.
- Analysis of momentum-dependent polarizability.
Main Results:
- Metallic substrates quench low- and high-energy plasmons of borophene at distances < 9 Å.
- A derived electrodynamic model accurately describes borophene's dielectric properties.
- Plasmonic performance is maximized by detuning borophene and substrate plasmon energies.
Conclusions:
- Substrate interactions fundamentally modify borophene's plasmonic behavior.
- The developed model provides a predictive tool for material design.
- Maximizing plasmon energy detuning is key for optimizing plasmonic applications.
