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APS -APS March Meeting 2017 - Event - On demand angle control in van der Waals heterostructures

机译:APS -APS 2017年3月会议-活动-范德华异质结构中的按需角度控制

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Fabricating layered heterostructures from the assembly of layered 2D crystals (so called, van der Waals (vdW) materials) has emerged as a new paradigm in nano-structured materials. One intriguing feature of these hybrid systems is that device characteristics often depend critically on the relative crystallographic orientation between adjacent layers. Experimental studies of these effects however have remained significantly constrained, owing to the inability to precisely control the rotation order. Here we present a new device architecture where the crystallographic alignment between layers can be manipulated in situ, while characterizing the electronic response. Variation in the rotational orientation to better than 0.5 degree is demonstrated, enabling for the first time a systematic experimental exploration in twisted layered structures. The angular dependence in a number of interesting van der Waals heterostructures will be discussed.
机译:由层状2D晶体组装而成的层状异质结构(所谓的范德华(vdW)材料)已经成为纳米结构材料的新范例。这些混合系统的一个吸引人的特征是,器件特性通常关键取决于相邻层之间的相对晶体学取向。但是,由于无法精确控制旋转顺序,因此对这些效果的实验研究仍然受到很大限制。在这里,我们提出了一种新的器件架构,其中各层之间的晶体学对准可以在表征电子响应的同时进行原位处理。结果表明,旋转方向的变化优于0.5度,这是首次在扭曲的层状结构中进行了系统的实验探索。将讨论许多有趣的范德华异质结构中的角度依赖性。

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