用微磁拉曼光谱探测单层到五层石墨烯中的电子激发
Probing electronic excitations in mono- to pentalayer graphene by micro-magneto-Raman spectroscopy
摘要：
我们探测朗道水平之间的电子激发独立的$N-$层石墨烯在一个广泛的能量范围内，前所未有的光谱和空间分辨率，使用微磁拉曼散射光谱。一个特性的演变，在多达五个Bernal堆叠的石墨烯层的电子带的证明，并显示显着遵循一个简单的理论方法，基于一个有效的双层模型。在探索新现象（特别是在量子霍尔效应领域）时，$(N>3)$层石墨烯似乎是有吸引力的候选物。我们的工作铺平了道路，以微创调查磁激子在其他新兴的低维系统，空间分辨率低至1 $~μ$ m。
英文摘要：
We probe electronic excitations between Landau levels in freestanding $N-$layer graphene over a broad energy range, with unprecedented spectral and spatial resolution, using micro-magneto Raman scattering spectroscopy. A characteristic evolution of electronic bands in up to five Bernal-stacked graphene layers is evidenced and shown to remarkably follow a simple theoretical approach, based on an effective bilayer model. $(N>3)$-layer graphene appear as appealing candidates in the quest for novel phenomena, particularly in the quantum Hall effect regime. Our work paves the way towards minimally-invasive investigations of magneto-excitons in other emerging low-dimensional systems, with a spatial resolution down to 1$~μ$m.
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