多功能二维CuSe单层纳米器件
Multifunctional 2D CuSe monolayer nanodevice
摘要：
在最近的实验工作中[Gao等人，2018高级材料。30，1707055]，实现了石墨烯样CuSe单层。受此成功的启发，我们进行了第一性原理计算，以研究其电子输运和光电性质。我们发现CuSe ML表现出很强的电各向异性，其电流-电压（I-V）曲线沿Z字形和扶手椅方向明显不同。当偏压超过1.0 V时，CuSe ML在两个方向上都表现出负微分电阻（NDR）效应，并且对橙光有很大的光子吸收。我们的研究表明，CuSe ML是一种多功能材料，在电各向异性基，NDR基，甚至光学纳米器件中具有各种潜在的应用。
英文摘要：
In a very recent experimental work [Gao et al., 2018 Adv. Mater. 30, 1707055], a graphene-like CuSe monolayer was realized. Motivated by this success, we performed first-principles calculations to investigate its electronic transport and photoelectronic properties. We find that the CuSe ML shows a strong electrical anisotropy, and its current-voltage (I-V) curves along the zigzag and armchair directions are noticeably different. The CuSe ML also displays a useful negative differential resistance (NDR) effect along the both directions when the bias is beyond 1.0 V. Moreover, it has a large photon absorption to orange light. Our study suggests that CuSe ML is a multifunctional material and has various potential applications in electrical-anisotropy-based, NDR-based, and even optical nanodevices.
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