Anomalous Phonon Modes in Black Phosphorus Revealed by Resonant Raman Scattering,The Journal of Physical Chemistry Letters

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Anomalous Phonon Modes in Black Phosphorus Revealed by Resonant Raman Scattering
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-05-10 00:00:00 , DOI: 10.1021/acs.jpclett.8b01098
Xingzhi Wang ₁ , Nannan Mao _{1,

2} , Weijun Luo ₁ , Hikari Kitadai ₁ , Xi Ling _{1,

3,

4}

Affiliation

Black phosphorus (BP), a layered material with puckered crystalline structure in each layer, has drawn intense interest due to its unique optical and electronic properties. In particular, the intricate Raman scattering effect in BP is intriguing and provides a platform for researchers to probe the physical properties of BP in depth. Here we report the first observation of anomalous modes with the frequency in the range of 100–900 cm^–1 in BP due to the resonant Raman effect. The origin and assignment of the anomalous modes are discussed based on the excitation energy- and angle-dependent Raman measurements. Density functional theory (DFT) calculated electronic band structure is used to support our understanding. The newly observed phonon modes could serve as a unique probe for the fine electronic structures and the exciton–phonon couplings, which promote a better understanding of BP for potential nanoelectronic and nanophotonic applications in the future.

中文翻译：

共振拉曼散射揭示黑色磷的异常声子模。

黑磷（BP）是一种在每层中具有褶皱晶体结构的层状材料，由于其独特的光学和电子特性而引起了人们的极大兴趣。特别是，BP中复杂的拉曼散射效应引人入胜，并为研究人员提供了一个平台来深入研究BP的物理特性。在这里，我们报告了频率在100–900 cm ^–1范围内的异常模式的首次观察在BP中由于共振拉曼效应。基于激发能量和角度相关的拉曼测量值，讨论了异常模式的起源和分配。密度泛函理论（DFT）计算的电子能带结构用于支持我们的理解。新近观察到的声子模式可以作为精细电子结构和激子-声子耦合的独特探针，从而促进对BP在未来潜在的纳米电子和纳米光子应用中的更好理解。

更新日期：2018-05-10

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