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首页> 外文期刊>Physical Review X >Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB 2
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Experimental Observation of Dirac Nodal Links in Centrosymmetric Semimetal TiB 2

机译：CentroSymmetric Semimetal Tib 2中Dirac Nodal Link的实验观察2

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The topological nodal-line semimetal state, serving as a fertile ground for various topological quantum phases, where a topological insulator, Dirac semimetal, or Weyl semimetal can be realized when the certain protecting symmetry is broken, has only been experimentally studied in very few materials. In contrast to discrete nodes, nodal lines with rich topological configurations can lead to more unusual transport phenomena. Utilizing angle-resolved photoemission spectroscopy and first-principles calculations, here, we provide compelling evidence of nodal-line fermions in centrosymmetric semimetal TiB 2 with a negligible spin-orbit coupling effect. With the band crossings just below the Fermi energy, two groups of Dirac nodal rings are clearly observed without any interference from other bands, one surrounding the Brillouin zone (BZ) corner in the horizontal mirror plane σ h and the other surrounding the BZ center in the vertical mirror plane σ v . The linear dispersions forming Dirac nodal rings are as wide as 2?eV. We further observe that the two groups of nodal rings link together along the Γ ‐ K direction, composing a nodal-link configuration. The simple electronic structure with Dirac nodal links mainly constituting the Fermi surfaces suggests TiB 2 as a remarkable platform for studying and applying the novel physical properties related to nodal-line fermions.
机译：拓扑结节线半态，用作各种拓扑量子相的肥沃地面，其中拓扑绝缘体，尾部绝缘体，狄拉克半型或Weyl半型在某些保护对称性破裂时，只有在非常少的材料中进行了实验研究。与离散节点相比，具有丰富拓扑结构的节点线可以导致更不寻常的运输现象。利用角度解析的光曝光光谱和第一原理计算，在这里，我们提供了令人焦虑的证据，以贫微对称半标数TIB 2中的卵石线离子术的证据具有可忽略不计的旋转轨道耦合效应。在Fermi Energy以下的频带交叉处，清楚地观察到两组DIRAC节点环，而没有来自其他频带的任何干扰，围绕水平镜面平面中的布里渊区（BZ）角σH和其他周围的BZ中心围绕BZ中心垂直镜平面σV。形成Dirac Nodal环的线性分散体具有宽至2°EEx。我们进一步观察到两组节点环沿γ - k方向连接在一起，构成节点连杆配置。具有主要构成费米表面的Dirac Nodal链路的简单电子结构表明TIB 2作为学习和应用与Nodal-Line Fermions相关的新型物理性质的显着平台。

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