Topological node-line semimetal in three-dimensional graphene networks

Topological node-line semimetal in three-dimensional graphene networks
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三维石墨烯网络中的拓扑节点线半金属

DOI:
10.1103/physrevb.92.045108
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发表时间:
2014-11
期刊:
影响因子:
3.7
通讯作者:
Kawazoe, Yoshiyuki
Kawazoe, Yoshiyuki
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yu, Rui;Fang, Zhong;Dai, Xi;Kawazoe, Yoshiyuki

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石墨烯是一种二维(2D)碳片,其电子结构的狄拉克点性质具有可忽略的自旋轨道耦合,从而获得了许多令人惊叹的特性。延伸到3D空间,具有负曲率的石墨烯网络,称为Mackay-Terrones晶体(MTCs),已经被提出并进行了实验探索,但其拓扑性质尚未被发现。基于第一性原理计算,我们报道了一个具有拓扑非平凡电子态的全碳MTC,并展示了大量的节线。当节点线投影到表面上形成圆时,就形成了位于圆内部的“鼓面”状平面带。在没有反演对称性的情况下,体节点线可以演化成3D狄拉克点,在最近的实验中,反演对称性的存在已经被证明是合理的。
Graphene, a two-dimensional (2D) carbon sheet, acquires many of its amazing properties from the Dirac point nature of its electronic structures with negligible spin-orbit coupling. Extending to 3D space, graphene networks with negative curvature, called Mackay-Terrones crystals (MTCs), have been proposed and experimentally explored, yet their topological properties have yet to be discovered. Based on the first-principle calculations, we report an all-carbon MTC with topologically nontrivial electronic states by exhibiting node lines in bulk. When the node lines are projected onto surfaces to form circles, ``drumhead''-like flat surface bands nestled inside of the circles are formed. The bulk node line can evolve into a 3D Dirac point in the absence of inversion symmetry, the existence of which has been shown to be plausible in recent experiments.
DOI: --
发表时间: 2011
期刊: --
影响因子: --
作者:
Xiangang Wan;Ari M. Turner;A. Vishwanath
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