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

@article{Belopolski2019DiscoveryOT,
title={Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet},
author={Ilya Belopolski and Kaustuv Manna and D. Sevilla Sanchez and Guoqing Chang and Benedikt Ernst and Jia-Xin Yin and Songtian S. Zhang and Tyler A. Cochran and Nana Shumiya and Hao Zheng and Bahadur Singh and Guang Bian and Daniel Multer and Maksim Litskevich and Xiaoting Zhou and Shin-Ming Huang and BaoKai Wang and Tay-Rong Chang and Su-Yang Xu and Arun Bansil and Claudia Felser and Hsin Lin and M Zahid Hasan},
journal={Science},
year={2019},
volume={365},
pages={1278 - 1281}
}
Magnetic Weyl semimetals Weyl semimetals (WSMs)—materials that host exotic quasiparticles called Weyl fermions—must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identified, but showing unambiguously that a material is a time-reversal-breaking WSM is tricky. Three groups now provide spectroscopic evidence for this latter state in magnetic materials (see the Perspective by da Silva Neto). Belopolski et al. probed the material… Expand
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#### References

SHOWING 1-10 OF 52 REFERENCES
Discovery of Weyl fermion semimetals and topological Fermi arc states
• Physics
• 2017
Weyl semimetals are conductors whose low-energy bulk excitations are Weyl fermions, whereas their surfaces possess metallic Fermi arc surface states. These Fermi arc surface states are protected by aExpand
Large anomalous Hall current induced by topological nodal lines in a ferromagnetic van der Waals semimetal
A combined experimental and theoretical approach identifies the van der Waals material Fe3GeTe2 as a candidate ferromagnetic nodal line semimetal and extends the connections between topology and magnetism. Expand
Topological insulators, topological superconductors and Weyl fermion semimetals: discoveries, perspectives and outlooks
• Physics
• 2015
Unlike string theory, topological physics in lower dimensional condensed matter systems is an experimental reality since the bulk-boundary correspondence can be probed experimentally in lowerExpand
Giant anomalous Hall angle in a half-metallic magnetic Weyl semimetal
Magnetic Weyl semimetals (WSMs) with time reversal symmetry breaking exhibit Weyl nodes that act as monopoles of Berry curvature and are thus expected to generate a large intrinsic anomalous HallExpand
Topological nodal-line fermions in spin-orbit metal PbTaSe2
The detailed angle-resolved photoemission measurements, first-principles simulations and theoretical topological analysis illustrate the physical mechanism underlying the formation of the topological nodal-line states and associated surface states for the first time, thus paving the way towards exploring the exotic properties of the bottom-line fermions in condensed matter systems. Expand
Dirac Line Nodes in Inversion-Symmetric Crystals.
• Physics, Medicine
• Physical review letters
• 2015
The Z2 invariants dictating the presence of DLNs are developed based on parity eigenvalues at the parity-invariant points in reciprocal space and the effects of spin-orbit interactions and symmetry breaking are discussed. Expand
Topological surface superconductivity in doped Weyl loop materials
• Physics
• 2017
We study surface superconductivity involving the `drumhead' surface states of (doped) Weyl loop materials. The leading weak coupling instability in the bulk is toward a chiral superconducting order,Expand
Topological nodal semimetals
• Physics
• 2011
We present a study of “nodal-semimetal” phases in which nondegenerate conduction and valence bands touch at points (the “Weyl semimetal”) or lines (the “line-node semimetal”) in three-dimensionalExpand
Ca 3 P 2 and other topological semimetals with line nodes and drumhead surface states
• Physics
• 2016
Topological nodal line semimetals exhibit protected one-dimensional Fermi lines, which arise due to an intricate interplay between the symmetry and topology of the electronic wave functions. In thisExpand
Giant and anisotropic many-body spin–orbit tunability in a strongly correlated kagome magnet
The tunability of this kagome magnet reveals a strong interplay between an externally applied field, electronic excitations and nematicity, providing new ways of controlling spin–orbit properties and exploring emergent phenomena in topological or quantum materials10–12. Expand