Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet

Belopolski I, Manna K, Sanchez DS, Chang G, Ernst B, Yin J, Zhang SS, Cochran T, Shumiya N, Zheng H, Singh B, Bian G, Multer D, Litskevich M, Zhou X, Huang SM, Wang B, Chang TR, Xu SY, Bansil A, Felser C, Lin H, Hasan MZ (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Science American Association for the Advancement of Science

Book Volume: 365

Pages Range: 1278-1281

Journal Issue: 6459

DOI: 10.1126/science.aav2327

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.

Involved external institutions

Princeton University US United States (USA) (US) National Cheng Kung University TW Taiwan (TW) National Sun Yat-sen University TW Taiwan (TW) Northeastern University US United States (USA) (US) Academia Sinica / 中央研究院 TW Taiwan (TW) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Shenzhen University (SZU) / 深圳大学 CN China (CN) University of Missouri-Columbia (Mizzou) US United States (USA) (US)

How to cite

APA:

Belopolski, I., Manna, K., Sanchez, D.S., Chang, G., Ernst, B., Yin, J.,... Hasan, M.Z. (2019). Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. Science, 365(6459), 1278-1281. https://doi.org/10.1126/science.aav2327

MLA:

Belopolski, Ilya, et al. "Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet." Science 365.6459 (2019): 1278-1281.

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