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首页> 外文期刊>Nano letters >Emergence of One-Dimensional Wires of Free Carriers in Transition-Metal-Dichalcogenide Nanostructures
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Emergence of One-Dimensional Wires of Free Carriers in Transition-Metal-Dichalcogenide Nanostructures

机译：一维自由载流子线在过渡金属二硫键化物纳米结构中的出现

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摘要

We highlight the emergence of metallic states in two-dimensional transition-metal-dichalcogenide nanostructures nanoribbons, islands, and inversion domain boundaries as a widespread and universal phenomenon driven by the polar discontinuities occurring at their edges or boundaries. We show that such metallic states form one-dimensional wires of electrons or holes, with a free charge density that increases with the system size, up to complete screening of the polarization charge, and can also be controlled by the specific edge or boundary configurations, e.g., through chemisorption of hydrogen or sulfur atoms at the edges. For triangular islands, local polar discontinuities occur even in the absence of a total dipole moment for the island and lead to an accumulation of free carriers close to the edges, providing a consistent explanation of previous experimental observations. To further stress the universal character of these mechanisms, we show that polar discontinuities give rise to metallic states also at inversion domain boundaries. These findings underscore the potential of engineering transition-metal-dichalcogenide nanostructures for manifold applications in nano- and optoelectronics, spintronics, catalysis, and solar-energy harvesting.
机译：我们强调了二维过渡金属-二卤化碳纳米结构中的金属态的出现，纳米带，岛和反演域边界是一种普遍的普遍现象，是由其边缘或边界处的极性不连续性驱动的。我们表明，这种金属态形成一维电子或空穴的金属线，其自由电荷密度随系统尺寸的增加而增加，直至完全屏蔽极化电荷，并且还可以通过特定的边缘或边界构型进行控制，例如，通过边缘处氢或硫原子的化学吸附。对于三角岛，即使没有该岛的总偶极矩，局部极点也会出现不连续现象，并导致靠近边缘的自由载流子的积累，这为先前的实验观察提供了一致的解释。为了进一步强调这些机制的普遍性，我们证明了极性的不连续也会在反转畴边界处引起金属态。这些发现强调了工程过渡金属-二卤化碳纳米结构在纳米和光电子学，自旋电子学，催化和太阳能收集中的多种应用的潜力。

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