Issue 4, 2021

Anomalous plasmons in a two-dimensional Dirac nodal-line Lieb lattice

Abstract

Plasmons in two-dimensional (2D) Dirac materials feature an interesting regime with a tunable frequency, and long propagating length and lifetime, but are rarely achieved in the visible light regime. Using a tight-binding (TB) model in combination with first-principles calculations, we investigated plasmon modes in a 2D Lieb lattice with a Dirac nodal-line electronic structure. In contrast to conventional 2D plasmons, anomalous plasmons in the Lieb lattice exhibit the unique features of a carrier-density-independent frequency, being Landau-damping free in a wide-range of wave vectors, a high frequency, and high subwavelength confinement. Remarkably, by using first-principles calculations, we proposed a candidate material, 2D Be2C monolayer, to achieve these interesting plasmon properties. The plasmons in the Be2C monolayer can survive up to the visible frequency region and propagate to large momentum transfer that has rarely been reported. The anomalous plasmons revealed in the Lieb lattice offer a promising platform for the study of 2D plasmons as well as the design of 2D plasmonic materials.

Graphical abstract: Anomalous plasmons in a two-dimensional Dirac nodal-line Lieb lattice

Supplementary files

Article information

Article type
Paper
Submitted
09 Sep 2020
Accepted
24 Dec 2020
First published
26 Dec 2020
This article is Open Access
Creative Commons BY license

Nanoscale Adv., 2021,3, 1127-1135

Anomalous plasmons in a two-dimensional Dirac nodal-line Lieb lattice

C. Ding, H. Gao, W. Geng and M. Zhao, Nanoscale Adv., 2021, 3, 1127 DOI: 10.1039/D0NA00759E

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