Electron transport and quantum-dot energy levels in Z-shaped graphene nanoconstriction with zigzag edges
Electron transport and quantum-dot energy levels in Z-shaped graphene nanoconstriction with zigzag edges
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DOI：
10.12693/aphyspola.118.238
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发表时间：
2009-11
期刊：
影响因子：
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通讯作者：
A. Rycerz
中科院分区：
文献类型：
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作者：
A. Rycerz
受石墨烯纳米结构制造最新进展的推动，我们发现电子可以被捕获在具有锯齿形边缘的 Z 形石墨烯纳米收缩中。颈缩的中心部分作为单级量子点运行，因为流向附属部分（旋转 60 度）的电流由于不匹配的谷极化而受到强烈抑制，尽管每个隔离部分都显示电导 $G_0=2e^2/h$ 的最大量子值。我们进一步表明，除了两个相邻部分的宽度相等的情况外，捕获机制对收缩几何的细节不敏感。还建立了与早期通过具有锯齿形边缘的对称和不对称扭结的电子传输研究的关系。
Motivated by recent advances in fabricating graphene nanostructures, we find that an electron can be trapped in Z-shaped graphene nanoconstriction with zigzag edges. The central section of the constriction operates as a single-level quantum dot, as the current flow towards the adjunct sections (rotated by 60 degree) is strongly suppressed due to mismatched valley polarization, although each section in isolation shows maximal quantum value of the conductance $G_0=2e^2/h$. We further show, that the trapping mechanism is insensitive to the details of constriction geometry, except from the case when widths of the two neighboring sections are equal. The relation with earlier studies of electron transport through symmetric and asymmetric kinks with zigzag edges is also established.