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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Chirality Josephson Current Due to a Novel Quantum Anomaly in Inversion-Asymmetric Weyl Semimetals.
TL;DR: The study of Josephson junctions based on inversion-asymmetric but time-reversal symmetric Weyl semimetals under the influence of Zeeman fields finds that, due to distinct spin textures, the Weyl nodes of opposite chirality respond differently to an external magnetic field.
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Global topology of Weyl semimetals and Fermi arcs
Varghese Mathai,Guo Chuan Thiang +1 more
TL;DR: In this paper, a topological classification of generalised Weyl semimetals is provided, in any spatial dimension and with arbitrary Weyl surfaces which may be non-trivially linked.
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Fermi arc mediated entropy transport in topological semimetals
TL;DR: In this paper, the authors proposed a pathway for entropy transport involving Fermi arcs on one surface connecting to the other surface via the bulk Weyl monopoles, and provided results for the temperature and magnetic field dependence of the magnetothermal conductance of this conveyor belt channel.
Journal ArticleDOI
Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs
Haitao Yang,Lexian Yang,Zhongkai Liu,Yan Sun,Cheng Chen,Han Peng,Markus A. Schmidt,Dharmalingam Prabhakaran,B. A. Bernevig,Claudia Felser,Binghai Yan,Yulin Chen +11 more
TL;DR: In this paper, the authors demonstrate successful manipulation of the shape, size and even the connections of surface Fermi arcs in a model topological Weyl semimetals (TWSs), and observe their evolution that leads to an unusual topological Lifshitz transition not caused by the change of the carrier concentration.
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Triply degenerate nodal points and topological phase transitions in NaCu3Te2
TL;DR: Using symmetry analysis and ab initio calculations, the authors proposed that the three-dimensional honeycomb crystal hosts triply degenerate nodal points (TDNPs) residing at the Fermi level.
References
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TL;DR: In this paper, the topological semimetal, a three-dimensional phase of a magnetic solid, is described and it may be realized in a class of pyrochlore iridates based on calculations using the LDA+U$ method.
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Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
Su-Yang Xu,Ilya Belopolski,Nasser Alidoust,Madhab Neupane,Chenglong Zhang,Raman Sankar,Shin-Ming Huang,Chi-Cheng Lee,Guoqing Chang,Baokai Wang,Guang Bian,Hao Zheng,Daniel S. Sanchez,Fangcheng Chou,Hsin Lin,Shuang Jia,M. Zahid Hasan +16 more
TL;DR: The experimental discovery of a Weyl semimetal, tantalum arsenide (TaAs), using photoemission spectroscopy, which finds that Fermi arcs terminate on the Weyl fermion nodes, consistent with their topological character.
Journal ArticleDOI
Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
TL;DR: In this article, the electronic structure of pyrochlore iridates was investigated using density functional theory, LDA+U method, and effective low energy models, and a remarkably rich phase diagram emerges on tuning the correlation strength U.
Journal ArticleDOI
Discovery of a Weyl fermion semimetal and topological Fermi arcs
Su-Yang Xu,Ilya Belopolski,Nasser Alidoust,Madhab Neupane,Madhab Neupane,Guang Bian,Chenglong Zhang,Raman Sankar,Guoqing Chang,Zhujun Yuan,Chi-Cheng Lee,Shin-Ming Huang,Hao Zheng,Jie Ma,Daniel S. Sanchez,Baokai Wang,Baokai Wang,Arun Bansil,Fangcheng Chou,Pavel Shibayev,Hsin Lin,Shuang Jia,M. Zahid Hasan +22 more
TL;DR: In this article, the experimental discovery of a Weyl semimetal, tantalum arsenide (TaAs), was reported, which is a new state of matter that hosts Weyl fermions as emergent quasiparticles and admits a topological classification that protects Fermi arcs on the boundary of a bulk sample.
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