Observation of Weyl nodes in TaAs
B. Q. Lv,B. Q. Lv,Nan Xu,Nan Xu,Hongming Weng,Junzhang Ma,Junzhang Ma,Pierre Richard,Xiong Huang,Lin Zhao,Genfu Chen,Christian Matt,Federico Bisti,Vladimir N. Strocov,Joël Mesot,Joël Mesot,Joël Mesot,Zhong Fang,Xi Dai,Tian Qian,Ming Shi,Hong Ding +21 more
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TLDR
In this article, the authors reported the direct observation in TaAs of the long-sought-after Weyl nodes by performing bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy measurements.Abstract:
Experiments show that TaAs is a three-dimensional topological Weyl semimetal. In 1929, H. Weyl proposed that the massless solution of the Dirac equation represents a pair of a new type of particles, the so-called Weyl fermions1. However, their existence in particle physics remains elusive after more than eight decades. Recently, significant advances in both topological insulators and topological semimetals have provided an alternative way to realize Weyl fermions in condensed matter, as an emergent phenomenon: when two non-degenerate bands in the three-dimensional momentum space cross in the vicinity of the Fermi energy (called Weyl nodes), the low-energy excitations behave exactly as Weyl fermions. Here we report the direct observation in TaAs of the long-sought-after Weyl nodes by performing bulk-sensitive soft X-ray angle-resolved photoemission spectroscopy measurements. The projected locations at the nodes on the (001) surface match well to the Fermi arcs, providing undisputable experimental evidence for the existence of Weyl fermionic quasiparticles in TaAs.read more
Citations
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Weyl and Dirac semimetals in three-dimensional solids
TL;DR: Weyl and Dirac semimetals as discussed by the authors are three-dimensional phases of matter with gapless electronic excitations that are protected by topology and symmetry, and they have generated much recent interest.
Journal ArticleDOI
Classification of topological quantum matter with symmetries
TL;DR: In this article, a review of the classification schemes of both fully gapped and gapless topological materials is presented, and a pedagogical introduction to the field of topological band theory is given.
Journal ArticleDOI
Experimental Discovery of Weyl Semimetal TaAs
B. Q. Lv,Hongming Weng,B. B. Fu,Xiaoping Wang,Xiaoping Wang,Hu Miao,Junzhang Ma,Pierre Richard,Xiaochun Huang,Lingxiao Zhao,Genfu Chen,Zhong Fang,Xi Dai,Tian Qian,Hong Ding +14 more
TL;DR: Weyl fermions possess exotic properties and can act like magnetic monopoles as discussed by the authors, and TaAs is a Weyl semimetal, demonstrating for the first time that Weyl semi-metals can be identified experimentally.
Journal ArticleDOI
A Weyl Fermion semimetal with surface Fermi arcs in the transition metal monopnictide TaAs class
Shin-Ming Huang,Su-Yang Xu,Ilya Belopolski,Chi-Cheng Lee,Guoqing Chang,Baokai Wang,Baokai Wang,Nasser Alidoust,Guang Bian,Madhab Neupane,Madhab Neupane,Chenglong Zhang,Shuang Jia,Arun Bansil,Hsin Lin,M. Zahid Hasan +15 more
TL;DR: The results show that in the TaAs-type materials the WeylSemimetal state does not depend on fine-tuning of chemical composition or magnetic order, which opens the door for the experimental realization of Weyl semimetals and Fermi arc surface states in real materials.
Journal ArticleDOI
Topological Materials: Weyl Semimetals
Binghai Yan,Claudia Felser +1 more
TL;DR: In this paper, the authors review the basic concepts and compare these topological states of matter from the materials perspective with a special focus on Weyl semimetals, and introduce the signatures of Weyl points in a pedagogical way, from Fermi arcs to the chiral magnetotransport properties.
References
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Topological electronic structure and Weyl semimetal in the TlBiSe 2 class of semiconductors
TL;DR: In this article, the authors present an analysis of bulk and surface electronic structures of thallium-based ternary III-V-VI-series of compounds TlMQ${}_{2}$, where the ab initio density functional theory framework is used.
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Electron scattering in tantalum monoarsenide
TL;DR: In this paper, the authors report comprehensive studies of the single crystal growth and electrical transport properties for various samples of TaAs, the first experimentally confirmed inversion symmetry-breaking Weyl semimetal.
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Intrinsic accuracy in 3-dimensional photoemission band mapping
TL;DR: In this paper, the intrinsic accuracy of 3D photoemission spectroscopy is investigated and a physically transparent picture involving interplay of the final and initial-state spectral functions is presented.
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Prediction of a Weyl semimetal in Hg 1 - X - Y Cd x Mn y Te
TL;DR: In this paper, the authors studied a magnetic field with two nodes in an experimentally reasonable region of the phase diagram and found that the Hall conductivity is proportional to the average Mn ion spin and thus is strongly temperature dependent.
Posted Content
Weyl Semimetal in Hg$_{1-x-y}$Cd$_x$Mn$_y$Te
TL;DR: In this article, the authors studied a magnetic field with two nodes in an experimentally reasonable region of the phase diagram and found that the Hall conductivity is proportional to the average Mn ion spin and thus is strongly temperature dependent.
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