Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS2

Niels B.M. Schröter; Iñigo Robredo; Sebastian Klemenz; Robert J. Kirby; Jonas A. Krieger; Ding Pei; Tianlun Yu; Samuel Stolz; Thorsten Schmitt; Pavel Dudin; Timur K. Kim; Cephise Cacho; Andreas Schnyder; Aitor Bergara; Vladimir N. Strocov; Fernando de Juan; Maia G. Vergniory; Leslie M. Schoop

doi:10.1126/SCIADV.ABD5000

Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS₂

Niels B.M. Schröter, Iñigo Robredo, Sebastian Klemenz, Robert J. Kirby, Jonas A. Krieger, Ding Pei, Tianlun Yu, Samuel Stolz, Thorsten Schmitt, Pavel Dudin, Timur K. Kim, Cephise Cacho, Andreas Schnyder, Aitor Bergara, Vladimir N. Strocov, Fernando de Juan, Maia G. Vergniory, Leslie M. Schoop

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Abstract

Magnetic Weyl semimetals are a newly discovered class of topological materials that may serve as a platform for exotic phenomena, such as axion insulators or the quantum anomalous Hall effect. Here, we use angle-resolved photoelectron spectroscopy and ab initio calculations to discover Weyl cones in CoS₂, a ferromagnet with pyrite structure that has been long studied as a candidate for half-metallicity, which makes it an attractive material for spintronic devices. We directly observe the topological Fermi arc surface states that link the Weyl nodes, which will influence the performance of CoS₂ as a spin injector by modifying its spin polarization at interfaces. In addition, we directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS₂ cannot be a true half-metal.

Original language	English (US)
Article number	eabd5000
Journal	Science Advances
Volume	6
Issue number	51
DOIs	https://doi.org/10.1126/SCIADV.ABD5000
State	Published - Dec 2020
Externally published	Yes

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Schröter, N. B. M., Robredo, I., Klemenz, S., Kirby, R. J., Krieger, J. A., Pei, D., Yu, T., Stolz, S., Schmitt, T., Dudin, P., Kim, T. K., Cacho, C., Schnyder, A., Bergara, A., Strocov, V. N., de Juan, F., Vergniory, M. G., & Schoop, L. M. (2020). Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS₂. Science Advances, 6(51), Article eabd5000. https://doi.org/10.1126/SCIADV.ABD5000

@article{84ddaba9c13a43d3a999d43f5c178f2f,

title = "Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS2",

abstract = "Magnetic Weyl semimetals are a newly discovered class of topological materials that may serve as a platform for exotic phenomena, such as axion insulators or the quantum anomalous Hall effect. Here, we use angle-resolved photoelectron spectroscopy and ab initio calculations to discover Weyl cones in CoS2, a ferromagnet with pyrite structure that has been long studied as a candidate for half-metallicity, which makes it an attractive material for spintronic devices. We directly observe the topological Fermi arc surface states that link the Weyl nodes, which will influence the performance of CoS2 as a spin injector by modifying its spin polarization at interfaces. In addition, we directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS2 cannot be a true half-metal.",

author = "Schr{\"o}ter, {Niels B.M.} and I{\~n}igo Robredo and Sebastian Klemenz and Kirby, {Robert J.} and Krieger, {Jonas A.} and Ding Pei and Tianlun Yu and Samuel Stolz and Thorsten Schmitt and Pavel Dudin and Kim, {Timur K.} and Cephise Cacho and Andreas Schnyder and Aitor Bergara and Strocov, {Vladimir N.} and {de Juan}, Fernando and Vergniory, {Maia G.} and Schoop, {Leslie M.}",

note = "Funding Information: This work was supported by NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center DMR-1420541, by Princeton University through the Princeton Catalysis Initiative, and by the Gordon and Betty Moore Foundation through grant GBMF9064 to L.M.S. F.d.J. acknowledges funding from the Spanish MCI/AEI through grant no. PGC2018-101988-B-C21. M.G.V. and F.J. acknowledge funding from the Basque Government through grant PIBA 2019-81. M.G.V. and I.R. acknowledge the Spanish Ministerio de Ciencia e Innovacion (grant number PID2019-109905GB-C21). N.B.M.S. was supported by Microsoft. A.B. acknowledges financial support from the Spanish Ministry of Science and Innovation (PID2019-105488GB-I00). The work of S.S. was supported by the Swiss National Science Foundation under grant no. 159690. D.P. acknowledges the support from the Chinese Scholarship Council. J.A.K. acknowledges support by the Swiss National Science Foundation (SNF-Grant no. 200021_165910). Publisher Copyright: Copyright {\textcopyright} 2020 The Authors, some rights reserved.",

year = "2020",

month = dec,

doi = "10.1126/SCIADV.ABD5000",

language = "English (US)",

volume = "6",

journal = "Science Advances",

issn = "2375-2548",

publisher = "American Association for the Advancement of Science",

number = "51",

}

Schröter, NBM, Robredo, I, Klemenz, S, Kirby, RJ, Krieger, JA, Pei, D, Yu, T, Stolz, S, Schmitt, T, Dudin, P, Kim, TK, Cacho, C, Schnyder, A, Bergara, A, Strocov, VN, de Juan, F, Vergniory, MG & Schoop, LM 2020, 'Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS₂', Science Advances, vol. 6, no. 51, eabd5000. https://doi.org/10.1126/SCIADV.ABD5000

TY - JOUR

T1 - Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS2

AU - Schröter, Niels B.M.

AU - Robredo, Iñigo

AU - Klemenz, Sebastian

AU - Kirby, Robert J.

AU - Krieger, Jonas A.

AU - Pei, Ding

AU - Yu, Tianlun

AU - Stolz, Samuel

AU - Schmitt, Thorsten

AU - Dudin, Pavel

AU - Kim, Timur K.

AU - Cacho, Cephise

AU - Schnyder, Andreas

AU - Bergara, Aitor

AU - Strocov, Vladimir N.

AU - de Juan, Fernando

AU - Vergniory, Maia G.

AU - Schoop, Leslie M.

N1 - Funding Information: This work was supported by NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center DMR-1420541, by Princeton University through the Princeton Catalysis Initiative, and by the Gordon and Betty Moore Foundation through grant GBMF9064 to L.M.S. F.d.J. acknowledges funding from the Spanish MCI/AEI through grant no. PGC2018-101988-B-C21. M.G.V. and F.J. acknowledge funding from the Basque Government through grant PIBA 2019-81. M.G.V. and I.R. acknowledge the Spanish Ministerio de Ciencia e Innovacion (grant number PID2019-109905GB-C21). N.B.M.S. was supported by Microsoft. A.B. acknowledges financial support from the Spanish Ministry of Science and Innovation (PID2019-105488GB-I00). The work of S.S. was supported by the Swiss National Science Foundation under grant no. 159690. D.P. acknowledges the support from the Chinese Scholarship Council. J.A.K. acknowledges support by the Swiss National Science Foundation (SNF-Grant no. 200021_165910). Publisher Copyright: Copyright © 2020 The Authors, some rights reserved.

PY - 2020/12

Y1 - 2020/12

N2 - Magnetic Weyl semimetals are a newly discovered class of topological materials that may serve as a platform for exotic phenomena, such as axion insulators or the quantum anomalous Hall effect. Here, we use angle-resolved photoelectron spectroscopy and ab initio calculations to discover Weyl cones in CoS2, a ferromagnet with pyrite structure that has been long studied as a candidate for half-metallicity, which makes it an attractive material for spintronic devices. We directly observe the topological Fermi arc surface states that link the Weyl nodes, which will influence the performance of CoS2 as a spin injector by modifying its spin polarization at interfaces. In addition, we directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS2 cannot be a true half-metal.

AB - Magnetic Weyl semimetals are a newly discovered class of topological materials that may serve as a platform for exotic phenomena, such as axion insulators or the quantum anomalous Hall effect. Here, we use angle-resolved photoelectron spectroscopy and ab initio calculations to discover Weyl cones in CoS2, a ferromagnet with pyrite structure that has been long studied as a candidate for half-metallicity, which makes it an attractive material for spintronic devices. We directly observe the topological Fermi arc surface states that link the Weyl nodes, which will influence the performance of CoS2 as a spin injector by modifying its spin polarization at interfaces. In addition, we directly observe a minority-spin bulk electron pocket in the corner of the Brillouin zone, which proves that CoS2 cannot be a true half-metal.

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UR - http://www.scopus.com/inward/citedby.url?scp=85099075486&partnerID=8YFLogxK

U2 - 10.1126/SCIADV.ABD5000

DO - 10.1126/SCIADV.ABD5000

M3 - Article

C2 - 33355138

AN - SCOPUS:85099075486

SN - 2375-2548

VL - 6

JO - Science Advances

JF - Science Advances

IS - 51

M1 - eabd5000

ER -

Weyl fermions, Fermi arcs, and minority-spin carriers in ferromagnetic CoS₂

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