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首页> 外文期刊>Physical review >Valley polarized current and resonant electronic transport in a nonuniform MoS_2 zigzag nanoribbon
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Valley polarized current and resonant electronic transport in a nonuniform MoS_2 zigzag nanoribbon

机译：MoS_2之字形纳米带中的谷底极化电流和共振电子传输

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摘要

Using the tight-binding approach we study the electronic transport in a MoS_2 zigzag ribbon with a spatially varying potential profile. Considering a ribbon with a smooth potential step in the Fermi energy regime where the transport is dominated by the edge modes, we find that the conductance exhibits sharp resonances due to the resonant transport through a n-p-n junction effectively created in the structure. We show that in a gated wire the current carried on the wire edges can be blocked despite the metallic band structure of the ribbon. For the Fermi energies corresponding to MoS_2 bulk conduction band, we identify states of the semi-infinite wire that are polarized in the K, K', Q valleys and exhibit the valley Hall effect distinctly visible in a nonuniform ribbon. Finally, we show that well-defined momenta of the valley polarized modes allow nearly complete valley polarization of the current in a locally gated ribbon.
机译：使用紧密结合的方法，我们研究了MoS_2之字形带中的电子传输，该带具有空间变化的电位分布。考虑在费米能谱中带势势能阶跃平稳的带状结构，其中的输运由边缘模式控制，我们发现由于通过结构中有效创建的n-p-n结的谐振输运，电导表现出尖锐的谐振。我们显示出，在门控导线中，尽管带的金属带结构仍然存在，但可以阻止导线边缘上携带的电流。对于与MoS_2体导带相对应的费米能，我们确定了在K，K'，Q谷中极化的半无限线的状态，并显示出在不均匀带中清晰可见的谷霍尔效应。最后，我们显示出良好定义的谷极化模式的动量可以使局部选通带中的电流几乎完全实现谷极化。

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  • 来源
    《Physical review》 |2020年第8期|085425.1-085425.10|共10页
  • 作者

    D. Gut; M. Prokop; D. Sticlet; M. P. Nowak;

  • 作者单位

    AGH University of Science and Technology Faculty of Materials Science and Ceramics al. A. Mickiewicza 30 30-059 Krakow Poland;

    AGH University of Science and Technology Faculty of Metals Engineering and Industrial Computer Science al. A. Mickiewicza 30 30-059 Krakow Poland;

    National Institute for Research and Development of Isotopic and Molecular Technologies 67-103 Donat 400293 Cluj-Napoca Romania;

    AGH University of Science and Technology Academic Centre for Materials and Nanotechnology al. A. Mickiewicza 30 30-059 Krakow Poland;

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