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

Belopolski, Ilya; Manna, Kaustuv; Sanchez, Daniel S.; Chang, Guoqing; Ernst, Benedikt; Yin, Jiaxin; Zhang, Songtian S.; Cochran, Tyler; Shumiya, Nana; Zheng, Hao; Singh, Bahadur; Bian, Guang; Multer, Daniel; Litskevich, Maksim; Zhou, Xiaoting; Huang, Shin-Ming; Wang, Baokai; Chang, Tay-Rong; Xu, Su-Yang; Bansil, Arun; Felser, Claudia; Lin, Hsin; Hasan, M. Zahid

doi:10.1126/science.aav2327

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

Journal Article · 19 September 2019 · Science

DOI: https://doi.org/10.1126/science.aav2327 · OSTI ID:1608973

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^[1]; Ernst, Benedikt ^[2]; Yin, Jiaxin ^[1];

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^[3]; Bian, Guang ^[4]; Multer, Daniel ^[1];

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^[6]; Wang, Baokai ^[7];

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Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy (B7)
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Shenzhen Univ., Shenzhen (China). SZU-NUS Collaborative Center and International Collaborative Lab. of 2D Materials for Optoelectronic Science and Technology, College of Optoelectronic Engineering
Univ. of Missouri, Columbia, MO (United States)
National Cheng Kung Univ., Tainan (Taiwan)
National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
Northeastern Univ., Boston, MA (United States)
Academia Sinica, Taipei (Taiwan)
Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy (B7), and Princeton Inst. for Science and Technology of Materials; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF)

Grant/Contract Number:: AC02-76SF00515; FG02-05ER46200; FG02-07ER46352; AC02-05CH11231; 291472; 742068

OSTI ID:: 1608973

Alternate ID(s):: OSTI ID: 1632129

Journal Information:: Science, Vol. 365, Issue 6459; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 321 works

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