@article{9f34f03f612845daabd1b8f1783e81c1,
title = "Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet",
abstract = "Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.",
author = "Ilya Belopolski and Kaustuv Manna and Sanchez, {Daniel S.} and Guoqing Chang and Benedikt Ernst and Jiaxin Yin and Zhang, {Songtian S.} and Tyler Cochran and Nana Shumiya and Hao Zheng and Bahadur Singh and Guang Bian and Daniel Multer and Maksim Litskevich and Xiaoting Zhou and Huang, {Shin Ming} and Baokai Wang and Chang, {Tay Rong} and Xu, {Su Yang} and Arun Bansil and Claudia Felser and Hsin Lin and {Zahid Hasan}, M.",
note = "Funding Information: We thank D. Lu and M. Hashimoto at Beamlines 5-2 and 5-4 of the Stanford Synchrotron Radiation Lightsource (SSRL) at the SLAC National Accelerator Laboratory, CA, USA, and J. Denlinger at Beamline 4.0.3 and S.-K. Mo at Beamline 10.0.1 of the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory (LBNL), CA, USA, for support. Work at Princeton University is supported by the U.S. Department of Energy (DOE) under Basic Energy Sciences, grant no. DOE/BES DE-FG-02-05ER46200. I.B. acknowledges the support of the Harold W. Dodds Fellowship of Princeton University. The work at Northeastern University was supported by DOE, Office of Science, Basic Energy Sciences grant no. DE-FG02-07ER46352 and benefited from Northeastern University{\textquoteright}s Advanced Scientific Computation Center (ASCC) and the NERSC supercomputing center through DOE grant no. DE-AC02-05CH11231. Use of the Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-76SF00515. This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under contract no. DE-AC02-05CH11231. K.M., B.E., and C.F. acknowledge the financial support by the ERC Advanced Grant no. 291472 “Idea Heusler” and 742068 “TOPMAT.” STM characterization of samples was supported by the Gordon and Betty Moore Foundation (GBMF4547/Hasan). M.Z.H. acknowledges support from the Miller Institute of Basic Research in Science at the University of California at Berkeley and Lawrence Berkeley National Laboratory in the form of a Visiting Miller Professorship during the early stages of this work. M.Z.H. also acknowledges visiting scientist support from IQIM at the California Institute of Technology. Publisher Copyright: Copyright {\textcopyright} 2019 The Authors,",
year = "2019",
month = sep,
day = "20",
doi = "10.1126/science.aav2327",
language = "English (US)",
volume = "365",
pages = "1278--1281",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6459",
}