Anisotropic Fabry-Pérot resonant states confined within nano-steps on the topological insulator surface.
Anisotropic Fabry-Pérot resonant states confined within nano-steps on the topological insulator surface.
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DOI：
10.1038/srep05544
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发表时间：
2014-07-02
影响因子：
4.6
通讯作者：
Lin HQ
中科院分区：
文献类型：
--
作者：
Fu ZG;Zhang P;Chen M;Wang Z;Zheng FW;Lin HQ
利用表面敏感探针和体输运探针，主要在拓扑绝缘体（TI）的体材料和薄膜材料中发现了拓扑表面态的特殊性质，如无背散射、弱反局域化和量子反常霍尔效应。然而，它是同样重要的和实验上具有挑战性的限制无质量狄拉克费米子与TI表面上的纳米台阶。这种潜在的结构与法布里-佩罗谐振器中的线性分散光子具有相似的基础，同时保留了与经过充分研究的法布里-佩罗谐振器和贵金属表面量子围栏的根本差异。本文研究了TI表面上沿x（Γ-K）或y（Γ-M）方向沿着台阶内的无质量Dirac费米子，发现台阶间的电子局域态密度（LDOS）存在Fabry-Pérot-like共振，由于拓扑表面态的显著翘曲效应，与沿沿着Γ-K方向的阶梯阱相比，沿沿着Γ-M方向的阶梯阱中的LDOS呈现出各向异性的谐振模式。在存在翘曲效应的情况下，这两种情况下狄拉克费米子的透射性质和自旋取向也是各向异性的。
The peculiar nature of topological surface states, such as absence of backscattering, weak anti-localization, and quantum anomalous Hall effect, has been demonstrated mainly in bulk and film of topological insulator (TI), using surface sensitive probes and bulk transport probes. However, it is equally important and experimentally challenging to confine massless Dirac fermions with nano-steps on TI surfaces. This potential structure has similar ground with linearly-dispersed photons in Fabry-Pérot resonators, while reserving fundamental differences from well-studied Fabry-Pérot resonators and quantum corrals on noble metal surfaces. In this paper, we study the massless Dirac fermions confined within steps along the x (Γ–K) or y (Γ–M) direction on the TI surface, and the Fabry-Pérot-like resonances in the electronic local density of states (LDOS) between the steps are found. Due to the remarkable warping effect in the topological surface states, the LDOS confined in the step-well running along Γ-M direction exhibit anisotropic resonance patterns as compared to those in the step-well along Γ-K direction. The transmittance properties and spin orientation of Dirac fermion in both cases are also anisotropic in the presence of warping effect.
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影响因子：
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作者：
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