论文标题
自相似石墨烯地毯中的通用量子传输和杂质超级金属性
Universal quantum transport and impurity band super metallicity in self-similar graphene carpets
论文作者
论文摘要
分形是一个令人着迷的数学概念，在八十年代流行，数十年来一直保持着一种美丽的科学好奇心。随着纳米制作技术（例如纳米光刻）的巨大进步，已经可以设计具有精细结构至纳米尺度的自相似材料。在这里，我们研究了自我相似性对石墨烯Sierpinski地毯中量子电子传输的影响。我们发现，中间的电子频谱中的差距在其中间是一个平坦的零能量模式。尽管这些状态的速度为零，但在中立点发现了超级金属相。对于位于价/传导带中的费米能，在存在小的非弹性散射的情况下，系统保持金属，并发现运输强烈各向异性。
Fractals, a fascinating mathematical concept made popular in the eighties, remained for decades a beautiful scientific curiosity mainly. With the tremendous advances in nanofabrication techniques, such as nanolithography, it has become possible to design self-similar materials with fine structures down to nanometer scale. Here, we investigate the effects of self similarity on quantum electronic transport in graphene Sierpinski carpets. We find that a gap opens up in the electron spectrum in the middle of which lies a flat band of zeros energy modes. Although these states have a zero velocity, a supermetallic phase is found at the neutrality point. For Fermi energy located in the valence/conduction band and in the presence of a small inelastic scattering the system stays metallic and the transport is found strongly anisotropic.
