次近邻耦合对双层石墨烯光谱的影响
Effect of next-nearest neighbor coupling on the optical spectra in bilayer graphene
摘要：
我们研究的双层石墨烯（BLG）的光学电导率的依赖关系的层内和层间的相互作用，使用最完整的模型。我们发现，下一个最近的邻居层内耦合引入了新的功能，在低能量的光谱是高度敏感的样品掺杂，显着改变的“通用”电导。此外，其与层间耦合的相互作用导致在紫外范围内的电导的各向异性。我们建议，本征和掺杂BLG的光学电导率的实验测量将提供一个很好的基准内和层间耦合在不同的掺杂水平的相对重要性。
英文摘要：
We investigate the dependence of the optical conductivity of bilayer graphene (BLG) on the intra- and inter-layer interactions using the most complete model to date. We show that the next nearest-neighbor intralayer coupling introduces new features in the low-energy spectrum that are highly sensitive to sample doping, changing significantly the ``universal'' conductance. Further, its interplay with interlayer couplings leads to an anisotropy in conductance in the ultraviolet range. We propose that experimental measurement of the optical conductivity of intrinsic and doped BLG will provide a good benchmark for the relative importance of intra- and inter-layer couplings at different doping levels.
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