Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2

Nitesh Kumar; Mengyu Yao; Jayita Nayak; Maia G. Vergniory; Jörn Bannies; Zhijun Wang; Niels B.M. Schröter; Vladimir N. Strocov; Lukas Müchler; Wujun Shi; Emile D.L. Rienks; J. L. Mañes; Chandra Shekhar; Stuart S.P. Parkin; Jörg Fink; Gerhard H. Fecher; Yan Sun; B. Andrei Bernevig; Claudia Felser

doi:10.1002/adma.201906046

Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb₂

Nitesh Kumar, Mengyu Yao, Jayita Nayak, Maia G. Vergniory, Jörn Bannies, Zhijun Wang, Niels B.M. Schröter, Vladimir N. Strocov, Lukas Müchler, Wujun Shi, Emile D.L. Rienks, J. L. Mañes, Chandra Shekhar, Stuart S.P. Parkin, Jörg Fink, Gerhard H. Fecher, Yan Sun, B. Andrei Bernevig, Claudia Felser

Chemistry

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39 Scopus citations

Abstract

Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb₂ hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin–orbit interaction, a band inversion occurs.

Original language	English (US)
Article number	1906046
Journal	Advanced Materials
Volume	32
Issue number	11
DOIs	https://doi.org/10.1002/adma.201906046
State	Published - Mar 1 2020

All Science Journal Classification (ASJC) codes

General Materials Science
Mechanics of Materials
Mechanical Engineering

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Kumar, N., Yao, M., Nayak, J., Vergniory, M. G., Bannies, J., Wang, Z., Schröter, N. B. M., Strocov, V. N., Müchler, L., Shi, W., Rienks, E. D. L., Mañes, J. L., Shekhar, C., Parkin, S. S. P., Fink, J., Fecher, G. H., Sun, Y., Bernevig, B. A., & Felser, C. (2020). Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb₂ Advanced Materials, 32(11), Article 1906046. https://doi.org/10.1002/adma.201906046

@article{326ae132f66847039f94957c74712a28,

title = "Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2 ",

abstract = "Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb2 hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin–orbit interaction, a band inversion occurs.",

author = "Nitesh Kumar and Mengyu Yao and Jayita Nayak and Vergniory, {Maia G.} and J{\"o}rn Bannies and Zhijun Wang and Schr{\"o}ter, {Niels B.M.} and Strocov, {Vladimir N.} and Lukas M{\"u}chler and Wujun Shi and Rienks, {Emile D.L.} and Ma{\~n}es, {J. L.} and Chandra Shekhar and Parkin, {Stuart S.P.} and J{\"o}rg Fink and Fecher, {Gerhard H.} and Yan Sun and Bernevig, {B. Andrei} and Claudia Felser",

note = "Publisher Copyright: {\textcopyright} 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

year = "2020",

month = mar,

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doi = "10.1002/adma.201906046",

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Kumar, N, Yao, M, Nayak, J, Vergniory, MG, Bannies, J, Wang, Z, Schröter, NBM, Strocov, VN, Müchler, L, Shi, W, Rienks, EDL, Mañes, JL, Shekhar, C, Parkin, SSP, Fink, J, Fecher, GH, Sun, Y, Bernevig, BA & Felser, C 2020, 'Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb₂ ', Advanced Materials, vol. 32, no. 11, 1906046. https://doi.org/10.1002/adma.201906046

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T1 - Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb2

AU - Kumar, Nitesh

AU - Yao, Mengyu

AU - Nayak, Jayita

AU - Vergniory, Maia G.

AU - Bannies, Jörn

AU - Wang, Zhijun

AU - Schröter, Niels B.M.

AU - Strocov, Vladimir N.

AU - Müchler, Lukas

AU - Shi, Wujun

AU - Rienks, Emile D.L.

AU - Mañes, J. L.

AU - Shekhar, Chandra

AU - Parkin, Stuart S.P.

AU - Fink, Jörg

AU - Fecher, Gerhard H.

AU - Sun, Yan

AU - Bernevig, B. Andrei

AU - Felser, Claudia

PY - 2020/3/1

Y1 - 2020/3/1

N2 - Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb2 hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin–orbit interaction, a band inversion occurs.

AB - Multifold degenerate points in the electronic structure of metals lead to exotic behaviors. These range from twofold and fourfold degenerate Weyl and Dirac points, respectively, to sixfold and eightfold degenerate points that are predicted to give rise, under modest magnetic fields or strain, to topological semimetallic behaviors. The present study shows that the nonsymmorphic compound PdSb2 hosts six-component fermions or sextuplets. Using angle-resolved photoemission spectroscopy, crossing points formed by three twofold degenerate parabolic bands are directly observed at the corner of the Brillouin zone. The group theory analysis proves that under weak spin–orbit interaction, a band inversion occurs.

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Signatures of Sixfold Degenerate Exotic Fermions in a Superconducting Metal PdSb₂

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