Tunable Magneto-Optical Kerr Effect in Gated Monolayer Graphene in Terahertz Region
Tunable Magneto-Optical Kerr Effect in Gated Monolayer Graphene in Terahertz Region
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DOI：
10.7566/jpsj.82.074717
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发表时间：
2013-06
影响因子：
1.7
通讯作者：
Yixuan Zhou;Xinlong Xu;H. Fan;Z. Ren;Xiaoming Chen;J. Bai
中科院分区：
文献类型：
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作者：
Yixuan Zhou;Xinlong Xu;H. Fan;Z. Ren;Xiaoming Chen;J. Bai
磁光克尔效应（MOKE）作为一种简单而有效的方法，可以用来探测从量子效应到经典磁等离子体的各种物理性质。在这里，我们研究了石墨烯中太赫兹（THz）应用的电压依赖MOKE。结果表明，在量子区，反射谱主要携带对角电导率信息的真实的部分，而克尔旋转谱携带霍尔电导率信息的真实的部分，没有法布里-珀罗（FP）干涉.来自衬底的FP可以引起明显的形状变化，并对由相变引起的带间跃迁产生不同的信息，而对带内跃迁没有明显的变化。在经典区域，石墨烯的巨磁等离子体效应和磁电调制的协同效应可以导致宽带操纵。这也表明，高载流子密度，但有限的磁场是需要最大的克尔旋转。我们的研究结果揭示了基于MOKE的门控石墨烯的潜在太赫兹应用。
Magneto-optical Kerr effect (MOKE) as a simple but powerful method can be used for probing physical properties from quantum effects to classical magnetoplasmonics. Here, we study voltage-dependent MOKE for terahertz (THz) applications in graphene. The results suggest that in quantum regime the reflectivity spectrum mainly carry the real part of the diagonal conductivity information, while Kerr rotation spectrum carry the real part of Hall conductivity information without Fabry-Perot (FP) interferences. FP from substrates can bring apparent shape change and different informations for the interband transitions originating from the phase change, while no evident change for intraband transitions. In classic regime, the giant magnetoplasmons effect of graphene and the synergetic effect of magnetic and electric modulation can result in broad-band manipulation. It also suggests that high carrier density but limited magnetic field is needed for maximum Kerr rotation. Our results reveal potential THz applications with gated graphene based on MOKE.