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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.

Authors:
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  1. Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy (B7)
  2. Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  3. Shenzhen Univ., Shenzhen (China). SZU-NUS Collaborative Center and International Collaborative Lab. of 2D Materials for Optoelectronic Science and Technology, College of Optoelectronic Engineering
  4. Univ. of Missouri, Columbia, MO (United States)
  5. National Cheng Kung Univ., Tainan (Taiwan)
  6. National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
  7. Northeastern Univ., Boston, MA (United States)
  8. Academia Sinica, Taipei (Taiwan)
  9. 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)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF)
OSTI Identifier:
1608973
Alternate Identifier(s):
OSTI ID: 1632129
Grant/Contract Number:  
AC02-76SF00515; FG02-05ER46200; FG02-07ER46352; AC02-05CH11231; 291472; 742068
Resource Type:
Accepted Manuscript
Journal Name:
Science
Additional Journal Information:
Journal Volume: 365; Journal Issue: 6459; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

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, and Hasan, M. Zahid. Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. United States: N. p., 2019. Web. https://doi.org/10.1126/science.aav2327.
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. Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. United States. https://doi.org/10.1126/science.aav2327
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, and Hasan, M. Zahid. Thu . "Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet". United States. https://doi.org/10.1126/science.aav2327. https://www.osti.gov/servlets/purl/1608973.
@article{osti_1608973,
title = {Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet},
author = {Belopolski, Ilya and Manna, Kaustuv and Sanchez, Daniel S. and Chang, Guoqing and Ernst, Benedikt and Yin, Jiaxin and Zhang, Songtian S. and Cochran, Tyler and Shumiya, Nana and Zheng, Hao and Singh, Bahadur and Bian, Guang and Multer, Daniel and Litskevich, Maksim and Zhou, Xiaoting and Huang, Shin-Ming and Wang, Baokai and Chang, Tay-Rong and Xu, Su-Yang and Bansil, Arun and Felser, Claudia and Lin, Hsin and Hasan, M. Zahid},
abstractNote = {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.},
doi = {10.1126/science.aav2327},
journal = {Science},
number = 6459,
volume = 365,
place = {United States},
year = {2019},
month = {9}
}

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