Local optical conductivity of bilayer graphene with kink potential
Local optical conductivity of bilayer graphene with kink potential
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具有扭结势的双层石墨烯的局部光学电导率
DOI：
10.1103/physrevb.103.125149
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发表时间：
2021
影响因子：
3.7
通讯作者：
He Yan
中科院分区：
文献类型：
--
作者：
Dai Zhen-Bing;Li Zhiqiang;He Yan
我们研究了具有扭结势的双层石墨烯的光学响应，该扭结势由一个畴壁组成，该畴壁将两个具有相反层间偏压的AB区分开。基于连续介质模型，详细研究了真实的空间中的能带结构和局域光电导率。我们发现局域在畴壁的一维手征态对局域光电导率有显著的贡献，并且在不同的区域表现出明显的差异。畴壁态对电导率的影响可以通过空间和频率分辨的光谱特征来检测。从不同费米能级的光谱中，可以直接测量能带结构中的重要特征，例如两个手征态之间的能量分离。当畴壁区域较宽时，局域电导率的空间分布可以提供有关束缚态和拓扑畴壁态的重要信息。
We study the optical response of bilayer graphene with a kink potential composed of a domain wall separating two AB regions with opposite interlayer bias. The band structure and the local optical conductivity in real space are investigated in details based on a continuum model. We find that the one-dimensional chiral states localized at the domain wall contribute significantly to the local optical conductivity, which shows a clear distinction in different regions. The effects of domain wall states on optical conductivity can be detected by spatially and frequency resolved spectroscopic features. From the spectrum at various Fermi energies, important features in the band structure such as the energy separation between two chiral states can be directly measured. When the domain wall region is broad, the spatial distribution of local optical conductivity can provide important information on the bound states as well as the topological domain wall states.