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High-energy Optical Conductivity Of Graphene Determined By Reflection Contrast Spectroscopy

机译:反射对比度光谱法测定石墨烯的高能光电导率

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Optical conductivity G(ω) of graphene, which is famous for its universality close to the Dirac point, is determined from the visible to near-ultraviolet region by using reflection contrast spectroscopy. We find that the universality does not survive beyond the visible region. Instead, G(ω) increases rapidly with the energy, which is originated from the flat dispersion relation at the M point corresponding to an extraordinarily large density of states (DOS). The first-principles-calculated band structure and DOS spectrum explain well the high-energy behaviors of G(ω). Our work presents a more comprehensive map of graphene's optical conductivity and electronic structure.
机译:石墨烯的光导率G(ω)以其接近狄拉克点的普遍性而著名,它是使用反射对比光谱法从可见光到近紫外光区域确定的。我们发现,普遍性无法幸免于可见区域之外。取而代之的是,G(ω)随能量快速增加,这是由于M点处的平面色散关系所致,而M点处的状态密度非常大(DOS)。第一性原理计算的能带结构和DOS光谱很好地解释了G(ω)的高能行为。我们的工作提出了更全面的石墨烯的光导率和电子结构图。

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