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Dirac fermions in antiferromagnetic FeSn kagome lattices with combined space inversion and time-reversal symmetry

机译：反铁磁性FESN Kagome格子的Dirac离费米氏菌与组合空间反转和时间反转对称

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摘要

Symmetry principles play a critical role in formulating the fundamental laws of nature, with a large number of symmetry-protected topological states identified in recent studies of quantum materials. As compelling examples, massless Dirac fermions are jointly protected by the space inversion symmetry P and lime-reversal symmetry T supplemented by additional crystalline symmetry, while evolving into Weyl fermions when either P or T is broken. Here, based on first-principles calculations, we reveal that massless Dirac fermions are present in a layered FeSn crystal containing antiferromagnetically coupled ferromagnetic Fe kagome layers, where each of the P and T symmetries is individually broken but the combined PT symmetry is preserved. These stable Dirac fermions, protected by the combined PT symmetry with additional nonsymmorphic S_(2z)- symmetry, can be transformed to either massless/massive Weyl or massive Dirac fermions by breaking the PT or S_(2z) symmetry. Our angle-resolved photoemission spectroscopy experiments indeed observed the Dirac states in the bulk and two-dimensional Weyl-like states at the surface. The present paper substantially enriches our fundamental understanding of the intricate connections between symmetries and topologies of matter, especially with the spin degree of freedom playing a vital role.
机译：对称原理在制定自然的基本规律方面发挥着关键作用，在最近对量子材料的研究中确定了大量对称保护的拓扑状态。作为令人缩写的例子，通过补充额外的结晶对称的空间反转对称P和石灰反转对称性T的无阻塞污垢费粒度，同时当P或T断裂时，在威尔太阳体中发展。在这里，基于第一原理计算，我们揭示了无麻的DIRAC晶片在含有反铁掩镀的铁磁性FE Kagome层中的层状FESN晶体中存在，其中P和T对称中的每一个是单独破裂的，但是保留了组合的Pt对称性。这些稳定的DICAC以通过与附加非对称S_（2Z）对称的组合的Pt对称保护，可以通过破坏PT或S_（2Z）对称来转变为无麻自由/大规模的Weyl或大规模的Dirac码米。我们的角度分辨的光曝光光谱实验确实观察到在表面上散装和二维Weyl样状态中的狄拉克州。本文基本上丰富了对对称与物质拓扑之间错综复杂的联系的基本理解，特别是旋转自由度发挥重要作用。

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  • 来源
    《Physical review》 |2020年第15期|155103.1-155103.7|共7页
  • 作者

    Zhiyong Lin; Chongze Wang; Pengdong Wang; Seho Yi; Lin Lil; Qiang Zhang; Yi fan Wang; Zhongyi Wang; Hao Huang; Yan Sun; Yaobo Huang; Dawei Shen; Donglai Feng; Zhe Sun; Jun-Hyung Cho; Changgan Zeng; Zhenyu Zhang;

  • 作者单位

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    Department of Physics Research Institute for Natural Science and HYU-HPSTAR-CIS High Pressure Research Center Hanyang University 222 Wangsimni-ro Seongdong-Ku Seoul 04763 Republic of Korea;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China;

    Department of Physics Research Institute for Natural Science and HYU-HPSTAR-CIS High Pressure Research Center Hanyang University 222 Wangsimni-ro Seongdong-Ku Seoul 04763 Republic of Korea;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    Max Planck Institute for Chemical Physics of Solid Dresden D-01187 Germany;

    Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China;

    State Key Laboratory of Functional Materials for Informatics and Center for Excellence in Superconducting Electronics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China State Key Laboratory of Surface Physics Department of Physics and Advanced Materials Laboratory Fudan University Shanghai 200438 China;

    National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 China Max Planck Institute for Chemical Physics of Solid Dresden D-01187 Germany;

    Department of Physics Research Institute for Natural Science and HYU-HPSTAR-CIS High Pressure Research Center Hanyang University 222 Wangsimni-ro Seongdong-Ku Seoul 04763 Republic of Korea;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

    International Center for Quantum Design of Functional Materials Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Strongly Coupled Quantum Matter Physics Department of Physics and Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei Anhui 230026 China;

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