@article{376f6dc51b32459da55e952803e64650,
title = "Giant Chern number of a Weyl nodal surface without upper limit",
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.",
author = "Ma, {J. Z.} and Zhang, {S. N.} and Song, {J. P.} and Wu, {Q. S.} and Ekahana, {S. A.} and M. Naamneh and M. Radovic and Strocov, {V. N.} and Gao, {S. Y.} and T. Qian and H. Ding and K. He and K. Manna and C. Felser and Plumb, {N. C.} and Yazyev, {O. V.} and Xiong, {Y. M.} and M. Shi",
note = "Funding Information: We acknowledge T. L. Yu, Y. B. Huang, E. Rienks, M, Krivenkov, and A. Varykhalov for help during the ARPES experiments. This work was supported by the National Natural Science Foundation of China (Grant No. 12104379), the NCCR-MARVEL funded by the Swiss National Science Foundation, the Sino-Swiss Science and Technology Cooperation (Grant No. IZLCZ2-170075), and the Swiss National Science Foundation under Grant No. 200021_188413. M.R. and J.-Z.M. were supported by Project No. 200021_182695 funded by the Swiss National Science Foundation. J.-Z.M. is supported by City University of Hong Kong through the start-up project (Project No. 9610489), and by City University of Hong Kong Shenzhen Institute. S.A.E. acknowledges the support from NCCR-MARVEL funded by the Swiss National Science Foundation and the European Union's Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie Grant Agreement No. 701647. M.N. was supported by Swiss National Science Foundation Project No. 200021_159678. H.D. and T.Q. acknowledge financial support from the Ministry of Science and Technology of China (Grants No. 2016YFA0401000 and No. 2016YFA0300600), the National Natural Science Foundation of China (Grant No. U1832202), and the Chinese Academy of Sciences (Grants No. QYZDB-SSW-SLH043, No. XDB33000000, and No. XDB28000000). K.M. and C.F. acknowledge financial support from European Research Council Advanced Grant No. (742068) “TOP-MAT,” European Union's Horizon 2020 research and innovation programme (Grants No. 824123 and No. 766566) and Deutsche Forschungsgemeinschaft (Project-IDs No. 258499086 and No. FE 633/30-1). Y.-M.X. acknowledges financial support from the National Key Research and Development Program of China (Grant No. 2021YFA1600200), and the Collaborative Innovation Program of Hefei Science Center, CAS (Grant No. 2019HSC-CIP007). Publisher Copyright: {\textcopyright} 2022 American Physical Society.",
year = "2022",
month = mar,
day = "15",
doi = "10.1103/PhysRevB.105.115118",
language = "English",
volume = "105",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "11",
}