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arXiv 1806.02672physics.app-phcond-mat.mtrl-sciphysics.optics
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异戊烯中的等离子体激元

Plasmonics in Argentene

Ravishankar Sundararaman, Thomas Christensen, Yuan Ping, Nicholas Rivera, John D. Joannopoulos, Marin Soljačić, Prineha Narang

备注：
8 pages, 5 figures
发表信息：
Phys. Rev. Materials 4, 074011 (2020)
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摘要：

二维材料展现出一系列迷人的电子和光子特性，这些特性对于纳米光子学、量子光学和新兴的量子信息技术至关重要。结合从头算材料科学和纳米光子学领域的概念，现在有机会设计新的光子材料，其光学，传输和散射特性可以达到热力学和量子极限。在这里，我们提出了第一性原理计算预测，银，单晶六方密堆积单层，可以大大超过传统的等离子体材料的光学性能和导电性。在低频率的限制，我们表明，散射率和电阻率减少了三个因素相比，散装三维金属。最重要的是，低散射率延伸到光学频率，与例如石墨烯形成鲜明对比，石墨烯的散射率由于光学声子散射而在近红外范围内急剧增加。与固有的高载流子密度相结合，这有利于高度受限的表面等离子体延伸到可见频率。我们在三个不同的品质因数，跨越典型的等离子体激元应用的频谱，评估的Eketene;在每个，Eketene优于国家的最先进的。这种独特的组合属性将使Eketene一个有价值的除了二维异质结构工具包的量子电子和光子技术。

英文摘要：

Two-dimensional materials exhibit a fascinating range of electronic and photonic properties vital for nanophotonics, quantum optics and emerging quantum information technologies. Merging concepts from the fields of ab initio materials science and nanophotonics, there is now an opportunity to engineer new photonic materials whose optical, transport, and scattering properties are tailored to attain thermodynamic and quantum limits. Here, we present first-principles calculations predicting that Argentene, a single-crystalline hexagonal close-packed monolayer of Ag, can dramatically surpass the optical properties and electrical conductivity of conventional plasmonic materials. In the low-frequency limit, we show that the scattering rate and resistivity reduce by a factor of three compared to the bulk three-dimensional metal. Most importantly, the low scattering rate extends to optical frequencies in sharp contrast to e.g. graphene, whose scattering rate increase drastically in the near-infrared range due to optical-phonon scattering. Combined with an intrinsically high carrier density, this facilitates highly-confined surface plasmons extending to visible frequencies. We evaluate Argentene across three distinct figures of merit, spanning the spectrum of typical plasmonic applications; in each, Argentene outperforms the state-of-the-art. This unique combination of properties will make Argentene a valuable addition to the two-dimensional heterostructure toolkit for quantum electronic and photonic technologies.

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