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Few layer epitaxial germanene: a novel two-dimensional Dirac material

机译:少量外延锗烯:一种新型的二维狄拉克材料

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摘要

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.
机译:单层锗烯是一种类似于硅烯的新型石墨烯状锗同素异形体,最近已在金属基材上生长。重建的原子薄板直接躺在金属表面上,容易失去无质量的狄拉克费米子特性和独立的锗烯的独特关联物理特性。在这里,我们显示了通过干燥外延在金模板上形成的极少层锗烯由于相互作用减少而拥有狄拉克锥。建立在基于同步辐射的光发射,扫描隧道显微镜成像和表面电子衍射上的这一发现在稀有的二维Dirac材料中几乎没有层锗。由于锗目前用于主流的基于Si的电子产品中,因此使用锗缩小尺寸到5 nm节点以外的观点看来很有希望。其他引人入胜的特性似乎即将来临,通常是强大的量子自旋霍尔效应,用于自旋电子学中,以及用光将Floquet Majorana费米子工程化以用于量子计算。

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