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Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

Junzhang Ma1,2*, Quansheng Wu3,4, Meng Song5,6, Shengnan Zhang3,4, E.B. Guedes1, S.A. Ekahana1, M. Krivenkov7, Mengyu Yao8, Shunye Gao9, Wenhui Fan9, Tian Qian9,10, Hong Ding9,10,11, N.C. Plumb1, Milan Radovic1, J. H. Dil1,3, Yimin Xiong5, K. Manna8,12, C. Felser8, Oleg Yazyev3,4, Ming Shi1

1 Photon Science Division, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland

2 Department of Physics, City University of Hong Kong, Kowloon, Hong Kong, China

3 Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-10 15 Lausanne, Switzerland

4 National Center for Computational Design and Discovery of Novel Materials MARVEL, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

5 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory of the Chinese Academy of Sciences, Hefei, Anhui 230031, China

6 University of Science and Technology of China, Hefei, Anhui 230026, China

7 Helmholtz-Zentrum Berlin für Materialien und Energie, Elektronenspeicherring BESSY II, Albert-Einstein-Straße 15, 12489 Berlin, Germany

8 Max Planck Institute for Chemical Physics of Solids, Dresden, D-01187, Germany

9 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

10 Songshan Lake Materials Laboratory, Dongguan, Guangdong, China

11 CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing, China

12 Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India

* Corresponding authors emails: junzhama@cityu.edu.hk
DOI10.24435/materialscloud:m0-bb [version v1]

Publication date: Jun 30, 2021

How to cite this record

Junzhang Ma, Quansheng Wu, Meng Song, Shengnan Zhang, E.B. Guedes, S.A. Ekahana, M. Krivenkov, Mengyu Yao, Shunye Gao, Wenhui Fan, Tian Qian, Hong Ding, N.C. Plumb, Milan Radovic, J. H. Dil, Yimin Xiong, K. Manna, C. Felser, Oleg Yazyev, Ming Shi, Observation of a singular Weyl point surrounded by charged nodal walls in PtGa, Materials Cloud Archive 2021.99 (2021), doi: 10.24435/materialscloud:m0-bb.


This record contains all the raw data in the paper Nature Communications volume 12, Article number: 3994 (2021). Constrained by the Nielsen-Ninomiya no-go theorem, in all so-far experimentally determined Weyl semimetals (WSMs) the Weyl points (WPs) always appear in pairs in the momentum space with no exception. As a consequence, Fermi arcs occur on surfaces which connect the projections of the WPs with opposite chiral charges. However, this situation can be circumvented in the case of unpaired WP, without relevant surface Fermi arc connecting its surface projection, appearing singularly, while its Berry curvature field is absorbed by nontrivial charged nodal walls. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, we show experimentally that a singular Weyl point emerges in PtGa at the center of the Brillouin zone (BZ), which is surrounded by closed Weyl nodal walls located at the BZ boundaries and there is no Fermi arc connecting its surface projection. Our results reveal that nontrivial band crossings of different dimensionalities can emerge concomitantly in condensed matter, while their coexistence ensures the net topological charge of different dimensional topological objects to be zero. Our observation extends the applicable range of the original Nielsen-Ninomiya no-go theorem which was derived from zero dimensional paired WPs with opposite chirality. The ARPES data, calculated band structure, and related documents are attached in this record.

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Unpaired Weyl points Weyl nodal Plane Weyl nodal surface

Version history:

2021.99 (version v1) [This version] Jun 30, 2021 DOI10.24435/materialscloud:m0-bb