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Two-Dimensional Boron Polymorphs for Visible Range Plasmonics: A First-Principles Exploration.

Yuefei Huang¹, Sharmila N Shirodkar¹, Boris I Yakobson¹

¹Department of Materials Science and NanoEngineering, Rice University , Houston, Texas 77005, United States.

Journal of the American Chemical Society

|November 2, 2017

Summary

This summary is machine-generated.

Borophene, a novel 2D material, exhibits unique plasmonic properties due to its high electron concentration. These plasmons operate at high frequencies, even in the visible spectrum, without requiring doping.

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) materials offer unique electronic properties.
Borophene, a recently discovered 2D boron allotrope, exhibits metallic characteristics.
High free charge carrier concentration in borophene suggests potential for plasmonic behavior.

Purpose of the Study:

To investigate the plasmonic properties of borophene.
To calculate plasmon frequencies and dispersion relations in borophene structures.
To explore the potential of borophene for nanoplasmonic applications.

Main Methods:

Ab initio linear response computations of the dielectric function.
Calculation of plasmon frequencies (ω) for selected borophene structures.
Analysis of plasmon dispersion in the small wavevector (q) limit.

Main Results:

Borophene electrons behave like a 2D electron gas.
Plasmon dispersion follows the predicted ω ∝ √q dependence.
Undamped plasmon frequencies extend to the near-infrared and visible regions.

Conclusions:

Borophene is the first material supporting 2D plasmons at high frequencies without doping.
The tunability of borophene's metallicity and anisotropy allows for fine-tuning plasmon behavior.
Borophene shows significant promise for applications in nanoplasmonics.