Giant Chern number of a Weyl nodal surface without upper limit

Ma JZ, Zhang SN, Song JP, Wu QS, Ekahana SA, Naamneh M, Radovic M, Strocov VN, Gao SY, Qian T, Ding H, He K, Manna K, Felser C, Plumb NC, Yazyev O, Xiong YM, Shi M (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Review B American Physical Society

Book Volume: 105

Article Number: 115118

Journal Issue: 11

DOI: 10.1103/PhysRevB.105.115118

Abstract

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.

Involved external institutions

Paul Scherrer Institute (PSI) CH Switzerland (CH) Chinese Academy of Sciences (CAS) / 中国科学院 CN China (CN) Tsinghua University CN China (CN) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) City University of Hong Kong (CityU) CN China (CN) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH) Anhui University / 安徽大学 CN China (CN)

How to cite

APA:

Ma, J.-Z., Zhang, S.-N., Song, J.P., Wu, Q.-S., Ekahana, S.A., Naamneh, M.,... Shi, M. (2022). Giant Chern number of a Weyl nodal surface without upper limit. Physical Review B, 105(11). https://doi.org/10.1103/PhysRevB.105.115118

MLA:

Ma, J-Z, et al. "Giant Chern number of a Weyl nodal surface without upper limit." Physical Review B 105.11 (2022).

BibTeX: Download