Weyl, Dirac and high-fold chiral fermions in topological quantum materials.
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TLDR
A review of Weyl-line phases in magnetic topological materials can be found in this article, where the authors provide an introduction to the basic concepts underlying Weyl physics in condensed matter and to representative materials and their electronic structures and topology as revealed by spectroscopic studies.Abstract:
Quantum materials hosting Weyl fermions have opened a new era of research in condensed matter physics. First proposed in 1929 in particle physics, Weyl fermions have yet to be observed as elementary particles. In 2015, Weyl fermions were detected as collective electronic excitations in the strong spin-orbit coupled material tantalum arsenide, TaAs. This discovery was followed by a flurry of experimental and theoretical explorations of Weyl phenomena in materials. Weyl materials naturally lend themselves to the exploration of the topological index associated with Weyl fermions and their divergent Berry curvature field, as well as the topological bulk-boundary correspondence giving rise to protected conducting surface states. Here, we review the broader class of Weyl topological phenomena in materials, starting with the observation of emergent Weyl fermions in the bulk and of Fermi arc states on the surface of the TaAs family of crystals by photoemission spectroscopy. We then discuss some of the exotic optical and magnetic responses observed in these materials, as well as the progress in developing some of the related chiral materials. We discuss the conceptual development of high-fold chiral fermions, which generalize Weyl fermions, and we review the observation of high-fold chiral fermion phases by taking the rhodium silicide, RhSi, family of crystals as a prime example. Lastly, we discuss recent advances in Weyl-line phases in magnetic topological materials. With this Review, we aim to provide an introduction to the basic concepts underlying Weyl physics in condensed matter, and to representative materials and their electronic structures and topology as revealed by spectroscopic studies. We hope this work serves as a guide for future theoretical and experimental explorations of chiral fermions and related topological quantum systems with potentially enhanced functionalities.read more
Citations
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References
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Journal ArticleDOI
Fermi Arcs and Their Topological Character in the Candidate Type-II Weyl Semimetal MoTe 2
Anna Tamai,QuanSheng Wu,Irène Cucchi,Flavio Y. Bruno,S. Riccò,Timur K. Kim,Moritz Hoesch,Céline Barreteau,Enrico Giannini,Céline Besnard,Alexey A. Soluyanov,Alexey A. Soluyanov,Felix Baumberger,Felix Baumberger +13 more
TL;DR: In this article, the existence of type-II Weyl semimetals, which would be both conducting and insulating in different spatial directions, has been shown for the first time.
Journal ArticleDOI
Quasiparticle interference of the Fermi arcs and surface-bulk connectivity of a Weyl semimetal.
Hiroyuki Inoue,Andras Gyenis,Zhijun Wang,Jian Li,Seong Woo Oh,Shan Jiang,Ni Ni,B. Andrei Bernevig,Ali Yazdani +8 more
TL;DR: The measurements reveal 10 different scattering wave vectors, which can be understood and precisely reproduced with a theory that takes into account the shape, spin texture, and momentum-dependent propagation of the Fermi arc surface states into the bulk.
Journal ArticleDOI
Weyl semimetals from noncentrosymmetric topological insulators
Jianpeng Liu,David Vanderbilt +1 more
TL;DR: In this paper, the authors show that a Weyl semimetal always exists as an intermediate phase regardless of any constriant from lattice symmetries, although the interval of the critical region is sensitive to the choice of path in the parameter space and can be very narrow.
Journal ArticleDOI
Topological Hopf and Chain Link Semimetal States and Their Application to Co_{2}MnGa.
Guoqing Chang,Su-Yang Xu,Xiaoting Zhou,Shin-Ming Huang,Bahadur Singh,Baokai Wang,Ilya Belopolski,Jiaxin Yin,Songtian S. Zhang,Arun Bansil,Hsin Lin,M. Zahid Hasan,M. Zahid Hasan +12 more
TL;DR: In this paper, the authors show that the presence of perpendicular crystalline mirror planes can protect three-dimensional (3D) band crossings characterized by nontrivial links such as a Hopf link or a coupled chain, giving rise to a variety of new types of topological semimetals.
Journal ArticleDOI
Zero-Field Nernst Effect in a Ferromagnetic Kagome-Lattice Weyl-Semimetal Co 3 Sn 2 S 2
Satya N. Guin,Praveen Vir,Yang Zhang,Nitesh Kumar,Sarah J. Watzman,Chenguang Fu,Enke Liu,Enke Liu,Kaustuv Manna,Walter Schnelle,Johannes Gooth,Chandra Shekhar,Yan Sun,Claudia Felser +13 more
TL;DR: The results demonstrate the possibility of application of topological hard magnetic semimetals for low-power thermoelectric devices based on the Nernst effect and are thus valuable for the comprehensive understanding of transport properties in this class of materials.