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

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Anomalous plasmons in a two-dimensional Dirac nodal-line Lieb lattice
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-12-26 , DOI: 10.1039/d0na00759e
Chao Ding ₁ , Han Gao ₁ , Wenhui Geng ₁ , Mingwen Zhao ₁

Affiliation

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.

中文翻译：

二维狄拉克节线李布晶格中的异常等离子体

二维 (2D) 狄拉克材料中的等离激元具有可调谐频率、长传播长度和寿命的有趣状态，但在可见光状态下很少实现。使用紧束缚 (TB) 模型结合第一性原理计算，我们研究了具有狄拉克节线电子结构的二维 Lieb 晶格中的等离子体模式。与传统的二维等离激元相比，Lieb 晶格中的异常等离激元表现出与载流子密度无关的频率的独特特征，在宽波矢范围内无朗道阻尼、高频和高亚波长限制。值得注意的是，通过使用第一性原理计算，我们提出了一种候选材料，2D Be ₂C 单层，以实现这些有趣的等离子体特性。_{Be 2} C 单层中的等离激元可以存活到可见频率区域并传播到很少报道的大动量转移。Lieb 晶格中揭示的异常等离子体为二维等离子体的研究以及二维等离子体材料的设计提供了一个有前景的平台。

更新日期：2021-01-21

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