Few layer epitaxial germanene: a novel two-dimensional Dirac material.
Few layer epitaxial germanene: a novel two-dimensional Dirac material.
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DOI：
10.1038/srep20714
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发表时间：
2016-02-10
影响因子：
4.6
通讯作者：
Le Lay G
中科院分区：
文献类型：
--
作者：
Dávila ME;Le Lay G
单层锗烯是一种类似于硅烯的新型类石墨烯锗同素异形体，最近已在金属基底上生长。直接位于金属表面上的重建原子薄片很容易失去无质量狄拉克费米子特征和独立式锗烯的独特相关物理性质。在这里，我们展示了通过在金模板上干外延生长而产生的几层锗烯，由于相互作用减少而具有狄拉克锥。这一发现建立在基于同步辐射的光电子、扫描隧道显微镜成像和表面电子衍射的基础上，将少量的锗烯置于稀有的二维狄拉克材料中。由于锗目前用于主流硅基电子器件，因此使用锗烯缩小 5 nm 节点以上的前景似乎非常有希望。其他令人着迷的特性似乎就在眼前，通常是用于自旋电子学应用的强大量子自旋霍尔效应，以及用于量子计算的光工程 Floquet Majorana 费米子。
Monolayer germanene, a novel graphene-like germanium allotrope akin to silicene has been recently grown on metallic substrates. Lying directly on the metal surfaces the reconstructed atom-thin sheets are prone to lose the massless Dirac fermion character and unique associated physical properties of free standing germanene. Here, we show that few layer germanene, which we create by dry epitaxy on a gold template, possesses Dirac cones thanks to a reduced interaction. This finding established on synchrotron-radiation-based photoemission, scanning tunneling microscopy imaging and surface electron diffraction places few layer germanene among the rare two-dimensional Dirac materials. Since germanium is currently used in the mainstream Si-based electronics, perspectives of using germanene for scaling down beyond the 5 nm node appear very promising. Other fascinating properties seem at hand, typically the robust quantum spin Hall effect for applications in spintronics and the engineering of Floquet Majorana fermions by light for quantum computing.