Nexus fermions in topological symmorphic crystalline metals
Abstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has bee...
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doaj-2d0ff473169f4c17a0b6a7df1fb862b52020-12-08T01:05:29ZengNature Publishing GroupScientific Reports2045-23222017-05-017111310.1038/s41598-017-01523-8Nexus fermions in topological symmorphic crystalline metalsGuoqing Chang0Su-Yang Xu1Shin-Ming Huang2Daniel S. Sanchez3Chuang-Han Hsu4Guang Bian5Zhi-Ming Yu6Ilya Belopolski7Nasser Alidoust8Hao Zheng9Tay-Rong Chang10Horng-Tay Jeng11Shengyuan A. Yang12Titus Neupert13Hsin Lin14M. Zahid Hasan15Centre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityDepartment of Physics, National Sun Yat-sen UniversityLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityCentre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversitySchool of Physics, Beijing Institute of TechnologyLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityDepartment of Physics, National Tsing Hua UniversityDepartment of Physics, National Tsing Hua UniversityResearch Laboratory for Quantum Materials, Singapore University of Technology and DesignPrinceton Center for Theoretical Science, Princeton UniversityCentre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeLaboratory for Topological Quantum Matter and Spectroscopy (B7), Department of Physics, Princeton UniversityAbstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has been well-established that the known TMs can be classified by the dimensionality of the topologically protected band degeneracies. While Weyl and Dirac semimetals feature zero-dimensional points, the band crossing of nodal-line semimetals forms a one-dimensional closed loop. In this paper, we identify a TM that goes beyond the above paradigms. It shows an exotic configuration of degeneracies without a well-defined dimensionality. Specifically, it consists of 0D nexus with triple-degeneracy that interconnects 1D lines with double-degeneracy. We show that, because of the novel form of band crossing, the new TM cannot be described by the established results that characterize the topology of the Dirac and Weyl nodes. Moreover, triply-degenerate nodes realize emergent fermionic quasiparticles not present in relativistic quantum field theory. We present materials candidates. Our results open the door for realizing new topological phenomena and fermions including transport anomalies and spectroscopic responses in metallic crystals with nontrivial topology beyond the Weyl/Dirac paradigm.https://doi.org/10.1038/s41598-017-01523-8 |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan |
spellingShingle |
Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan Nexus fermions in topological symmorphic crystalline metals Scientific Reports |
author_facet |
Guoqing Chang Su-Yang Xu Shin-Ming Huang Daniel S. Sanchez Chuang-Han Hsu Guang Bian Zhi-Ming Yu Ilya Belopolski Nasser Alidoust Hao Zheng Tay-Rong Chang Horng-Tay Jeng Shengyuan A. Yang Titus Neupert Hsin Lin M. Zahid Hasan |
author_sort |
Guoqing Chang |
title |
Nexus fermions in topological symmorphic crystalline metals |
title_short |
Nexus fermions in topological symmorphic crystalline metals |
title_full |
Nexus fermions in topological symmorphic crystalline metals |
title_fullStr |
Nexus fermions in topological symmorphic crystalline metals |
title_full_unstemmed |
Nexus fermions in topological symmorphic crystalline metals |
title_sort |
nexus fermions in topological symmorphic crystalline metals |
publisher |
Nature Publishing Group |
series |
Scientific Reports |
issn |
2045-2322 |
publishDate |
2017-05-01 |
description |
Abstract Topological metals and semimetals (TMs) have recently drawn significant interest. These materials give rise to condensed matter realizations of many important concepts in high-energy physics, leading to wide-ranging protected properties in transport and spectroscopic experiments. It has been well-established that the known TMs can be classified by the dimensionality of the topologically protected band degeneracies. While Weyl and Dirac semimetals feature zero-dimensional points, the band crossing of nodal-line semimetals forms a one-dimensional closed loop. In this paper, we identify a TM that goes beyond the above paradigms. It shows an exotic configuration of degeneracies without a well-defined dimensionality. Specifically, it consists of 0D nexus with triple-degeneracy that interconnects 1D lines with double-degeneracy. We show that, because of the novel form of band crossing, the new TM cannot be described by the established results that characterize the topology of the Dirac and Weyl nodes. Moreover, triply-degenerate nodes realize emergent fermionic quasiparticles not present in relativistic quantum field theory. We present materials candidates. Our results open the door for realizing new topological phenomena and fermions including transport anomalies and spectroscopic responses in metallic crystals with nontrivial topology beyond the Weyl/Dirac paradigm. |
url |
https://doi.org/10.1038/s41598-017-01523-8 |
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