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Giant Chern number of a Weyl nodal surface without upper limit

Junzhang Ma1*, Shengnan Zhang2, Jiangpeng Song3, Quansheng Wu2, Sandy Ekahana4, Muntaser Naamneh4, Milan Radovic4, Vladimir Strocov4, Shunye Gao5, Tian Qian5, Hong Ding5, Ke He6, Kaustuv Manna7, Claudia Felser7, Nicholas Plumb4, Oleg Yazyev2, Yimin Xiong8, Ming Shi4

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

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

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

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

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

6 Department of Physics, Tsinghua University, Beijing 100084, China

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

8 Department of Physics, School of Physics and Optoelectronics Engineering, Anhui University, Hefei 230601, China

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

Publication date: Nov 10, 2022

How to cite this record

Junzhang Ma, Shengnan Zhang, Jiangpeng Song, Quansheng Wu, Sandy Ekahana, Muntaser Naamneh, Milan Radovic, Vladimir Strocov, Shunye Gao, Tian Qian, Hong Ding, Ke He, Kaustuv Manna, Claudia Felser, Nicholas Plumb, Oleg Yazyev, Yimin Xiong, Ming Shi, Giant Chern number of a Weyl nodal surface without upper limit, Materials Cloud Archive 2022.143 (2022), doi: 10.24435/materialscloud:xm-dm.


Weyl nodes can be classified into zero-dimensional (0D) Weyl points, 1D Weyl nodal lines, and 2D Weyl nodal surfaces (WNS), which possess finite Chern numbers. Up to date, the largest Chern number of WPs identified in Weyl semimetals is 4, which is thought to be a maximal value for linearly crossing points in solids. On the other hand, whether the Chern numbers of nonzero-dimensional linear crossing Weyl nodal objects have one upper limit is still an open question. In this work, combining angle-resolved photoemission spectroscopy with density-functional theory calculations, we show that the chiral crystal AlPt hosts a cube-shaped charged WNS which is formed by the linear crossings of two singly degenerate bands. Different from conventional Weyl nodes, the cube-shaped nodal surface in AlPt is enforced by nonsymmorphic chiral symmetries and time-reversal symmetry rather than accidental band crossings, and it possesses a giant Chern number |C|=26. Moreover, our results and analysis prove that there is no upper limit for the Chern numbers of such kind of 2D Weyl nodal object. This record includes the data in the related paper Phys. Rev. B 105, 115118 – Published 14 March 2022.

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File name Size Description
33.2 KiB The raw calculation data in Fig.1.
16.5 MiB The experimental data in Fig.2
10.8 MiB The experimental data in Fig.3


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External references

Journal reference (Paper in which the data is discussed.)


Giant Chern Number Weyl Nodal wall Weyl Nodal Surface Unpaired Weyl point

Version history:

2022.143 (version v1) [This version] Nov 10, 2022 DOI10.24435/materialscloud:xm-dm