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

Journal Article · · Science
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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)

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.

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
Citation Metrics:
Cited by: 268 works
Citation information provided by
Web of Science

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Cited By (14)

Finite bulk Josephson currents and chirality blockade removal from interorbital pairing in magnetic Weyl semimetals journal February 2020
“Weyl”ing away time-reversal symmetry journal September 2019
Weyl nodes and magnetostructural instability in antiperovskite Mn 3 ZnC journal December 2019
Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields journal January 2020
Modular Arithmetic with Nodal Lines: Drumhead Surface States in ZrSiTe journal February 2020
Inverse-perovskites A 3 B O ( A = Sr, Ca, Eu/ B = Pb, Sn): A platform for control of Dirac and Weyl Fermions journal December 2019
Spin-to-Charge Conversion in Magnetic Weyl Semimetals journal October 2019
Transition from intrinsic to extrinsic anomalous Hall effect in the ferromagnetic Weyl semimetal PrAlGe 1− x Si x journal January 2020
Magnetism and anomalous transport in the Weyl semimetal PrAlGe: possible route to axial gauge fields text January 2020
Spin-to-charge conversion in magnetic Weyl semimetals text January 2019
Modular Arithmetic with Nodal Lines: Drumhead Surface States in ZrSiTe text January 2019
Transition from Intrinsic to Extrinsic Anomalous Hall Effect in the Ferromagnetic Weyl Semimetal PrAlGe$_{1-x}$Si$_x$ text January 2019
Planar Hall effect caused by the memory of antiferromagnetic domain walls in Mn3Ge journal November 2020
THz range Faraday rotation in the Weyl Semimetal Candidate $\mathrm{Co_2TiGe}$ text January 2020

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