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Observation of topological nodal fermion semimetal phase in ZrSiS

机译:ZrSiS中的拓扑节点费米子半金属相的观察

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摘要

Unveiling new topological phases of matter is one of the current objectives in condensed matter physics. Recent experimental discoveries of Dirac and Weyl semimetals prompt the search for other exotic phases of matter. Here we present a systematic angle-resolved photoemission spectroscopy study of ZrSiS, a prime topological nodal semimetal candidate. Our wider Brillouin zone (BZ) mapping shows multiple Fermi surface pockets such as the diamond-shaped Fermi surface, elliptical-shaped Fermi surface, and a small electron pocket encircling at the zone center (Γ) point, the M point, and the X point of the BZ, respectively. We experimentally establish the spinless nodal fermion semimetal phase in ZrSiS, which is supported by our first-principles calculations. Our findings evidence that the ZrSiS-type of material family is a new platform on which to explore exotic states of quantum matter; these materials are expected to provide an avenue for engineering two-dimensional topological insulator systems.
机译:揭示物质新的拓扑阶段是凝聚态物理的当前目标之一。狄拉克(Dirac)和魏尔(Weyl)半金属的最新实验发现促使人们寻求物质的其他奇异相。在这里,我们介绍ZrSiS(一种主要的拓扑结点半金属候选物)的系统角度分辨光发射光谱研究。我们更宽的布里渊区(BZ)映射显示了多个费米表面凹坑,例如菱形费米表面,椭圆形费米表面,以及在区域中心(Γ)点,M点和X周围环绕的小电子凹坑BZ的点。我们通过实验原理在ZrSiS中建立无自旋的节点费米子半金属相,这得到了我们的第一性原理计算的支持。我们的发现证明ZrSiS型物质家族是探索量子物质外来状态的新平台。这些材料有望为工程二维拓扑绝缘体系统提供一条途径。

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  • 来源
    《Physical review》 |2016年第20期|201104.1-201104.6|共6页
  • 作者单位

    Department of Physics, University of Central Florida, Orlando, Florida 32816, USA;

    Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Physics, University of Central Florida, Orlando, Florida 32816, USA;

    Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland;

    Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA;

    Department of Physics, University of Central Florida, Orlando, Florida 32816, USA;

    Department of Physics, University of Central Florida, Orlando, Florida 32816, USA;

    Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden;

    Department of Physics and Astronomy, Uppsala University, P.O. Box 516, S-75120 Uppsala, Sweden;

    Institute of Low Temperature and Structure Research, Polish Academy of Sciences, 50-950 Wroclaw, Poland;

    Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan;

    Joseph Henry Laboratory and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA;

    Condensed Matter and Magnet Science Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

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