Weyl-like points from band inversions of spin-polarised surface states in NbGeSb

I. Marković; C. A. Hooley; O. J. Clark; F. Mazzola; M. D. Watson; J. M. Riley; K. Volckaert; K. Underwood; M. S. Dyer; P. A.E. Murgatroyd; K. J. Murphy; P. Le Fèvre; F. Bertran; J. Fujii; I. Vobornik; S. Wu; T. Okuda; J. Alaria; P. D.C. King

doi:10.1038/s41467-019-13464-z

Weyl-like points from band inversions of spin-polarised surface states in NbGeSb

I. Marković, C. A. Hooley, O. J. Clark, F. Mazzola, M. D. Watson, J. M. Riley, K. Volckaert, K. Underwood, M. S. Dyer, P. A.E. Murgatroyd, K. J. Murphy, P. Le Fèvre, F. Bertran, J. Fujii, I. Vobornik, S. Wu, T. Okuda, J. Alaria, P. D.C. King^*

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Band inversions are key to stabilising a variety of novel electronic states in solids, from topological surface states to the formation of symmetry-protected three-dimensional Dirac and Weyl points and nodal-line semimetals. Here, we create a band inversion not of bulk states, but rather between manifolds of surface states. We realise this by aliovalent substitution of Nb for Zr and Sb for S in the ZrSiS family of nonsymmorphic semimetals. Using angle-resolved photoemission and density-functional theory, we show how two pairs of surface states, known from ZrSiS, are driven to intersect each other near the Fermi level in NbGeSb, and to develop pronounced spin splittings. We demonstrate how mirror symmetry leads to protected crossing points in the resulting spin-orbital entangled surface band structure, thereby stabilising surface state analogues of three-dimensional Weyl points. More generally, our observations suggest new opportunities for engineering topologically and symmetry-protected states via band inversions of surface states.

Original language	English
Article number	5485
Journal	Nature Communications
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41467-019-13464-z
Publication status	Published - 1 Dec 2019

Bibliographical note

Funding Information:
We thank G. A. Fiete, A. P. Mackenzie, and V. Sunko for enlightening discussions. We gratefully acknowledge The Leverhulme Trust (Grant No. PLP-2015-144), The Royal Society, and the Engineering and Physical Sciences Research Council, UK (Grant No. EP/ R031924/1) for support. We are grateful to Soleil Synchrotron for access to beamline CASSIOPEE, Elettra Synchrotron for access to the APE beamline, and HiSOR Synchrotron for access to beamline BL-9B under the HiSOR Proposal No. 17BG022, which all contributed to this work, and the CALIPSOplus project under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. I.M. acknowledges financial support by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). O.J.C., J.M.R., and K.U. acknowledge EPSRC for studentship support through grant nos. EP/K503162/1 and EP/L505079/1, and EP/L015110/1. This work has been partly performed in the framework of the Nanoscience Foundry and Fine Analysis (NFFA-MIUR, Italy) facility. C.A.H. is grateful to Rice University for their hospitality during a four-month visiting professorship, where part of this work was carried out.

Publisher Copyright:
© 2019, The Author(s).

ASJC Scopus subject areas

General Chemistry
General Biochemistry,Genetics and Molecular Biology
General Physics and Astronomy

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Cite this

Marković, I., Hooley, C. A., Clark, O. J., Mazzola, F., Watson, M. D., Riley, J. M., Volckaert, K., Underwood, K., Dyer, M. S., Murgatroyd, P. A. E., Murphy, K. J., Fèvre, P. L., Bertran, F., Fujii, J., Vobornik, I., Wu, S., Okuda, T., Alaria, J., & King, P. D. C. (2019). Weyl-like points from band inversions of spin-polarised surface states in NbGeSb. Nature Communications, 10(1), Article 5485. https://doi.org/10.1038/s41467-019-13464-z

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title = "Weyl-like points from band inversions of spin-polarised surface states in NbGeSb",

abstract = "Band inversions are key to stabilising a variety of novel electronic states in solids, from topological surface states to the formation of symmetry-protected three-dimensional Dirac and Weyl points and nodal-line semimetals. Here, we create a band inversion not of bulk states, but rather between manifolds of surface states. We realise this by aliovalent substitution of Nb for Zr and Sb for S in the ZrSiS family of nonsymmorphic semimetals. Using angle-resolved photoemission and density-functional theory, we show how two pairs of surface states, known from ZrSiS, are driven to intersect each other near the Fermi level in NbGeSb, and to develop pronounced spin splittings. We demonstrate how mirror symmetry leads to protected crossing points in the resulting spin-orbital entangled surface band structure, thereby stabilising surface state analogues of three-dimensional Weyl points. More generally, our observations suggest new opportunities for engineering topologically and symmetry-protected states via band inversions of surface states.",

author = "I. Markovi{\'c} and Hooley, {C. A.} and Clark, {O. J.} and F. Mazzola and Watson, {M. D.} and Riley, {J. M.} and K. Volckaert and K. Underwood and Dyer, {M. S.} and Murgatroyd, {P. A.E.} and Murphy, {K. J.} and F{\`e}vre, {P. Le} and F. Bertran and J. Fujii and I. Vobornik and S. Wu and T. Okuda and J. Alaria and King, {P. D.C.}",

note = "Funding Information: We thank G. A. Fiete, A. P. Mackenzie, and V. Sunko for enlightening discussions. We gratefully acknowledge The Leverhulme Trust (Grant No. PLP-2015-144), The Royal Society, and the Engineering and Physical Sciences Research Council, UK (Grant No. EP/ R031924/1) for support. We are grateful to Soleil Synchrotron for access to beamline CASSIOPEE, Elettra Synchrotron for access to the APE beamline, and HiSOR Synchrotron for access to beamline BL-9B under the HiSOR Proposal No. 17BG022, which all contributed to this work, and the CALIPSOplus project under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. I.M. acknowledges financial support by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). O.J.C., J.M.R., and K.U. acknowledge EPSRC for studentship support through grant nos. EP/K503162/1 and EP/L505079/1, and EP/L015110/1. This work has been partly performed in the framework of the Nanoscience Foundry and Fine Analysis (NFFA-MIUR, Italy) facility. C.A.H. is grateful to Rice University for their hospitality during a four-month visiting professorship, where part of this work was carried out. Publisher Copyright: {\textcopyright} 2019, The Author(s).",

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doi = "10.1038/s41467-019-13464-z",

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Marković, I, Hooley, CA, Clark, OJ, Mazzola, F, Watson, MD, Riley, JM, Volckaert, K, Underwood, K, Dyer, MS, Murgatroyd, PAE, Murphy, KJ, Fèvre, PL, Bertran, F, Fujii, J, Vobornik, I, Wu, S, Okuda, T, Alaria, J & King, PDC 2019, 'Weyl-like points from band inversions of spin-polarised surface states in NbGeSb', Nature Communications, vol. 10, no. 1, 5485. https://doi.org/10.1038/s41467-019-13464-z

TY - JOUR

T1 - Weyl-like points from band inversions of spin-polarised surface states in NbGeSb

AU - Marković, I.

AU - Hooley, C. A.

AU - Clark, O. J.

AU - Mazzola, F.

AU - Watson, M. D.

AU - Riley, J. M.

AU - Volckaert, K.

AU - Underwood, K.

AU - Dyer, M. S.

AU - Murgatroyd, P. A.E.

AU - Murphy, K. J.

AU - Fèvre, P. Le

AU - Bertran, F.

AU - Fujii, J.

AU - Vobornik, I.

AU - Wu, S.

AU - Okuda, T.

AU - Alaria, J.

AU - King, P. D.C.

N1 - Funding Information: We thank G. A. Fiete, A. P. Mackenzie, and V. Sunko for enlightening discussions. We gratefully acknowledge The Leverhulme Trust (Grant No. PLP-2015-144), The Royal Society, and the Engineering and Physical Sciences Research Council, UK (Grant No. EP/ R031924/1) for support. We are grateful to Soleil Synchrotron for access to beamline CASSIOPEE, Elettra Synchrotron for access to the APE beamline, and HiSOR Synchrotron for access to beamline BL-9B under the HiSOR Proposal No. 17BG022, which all contributed to this work, and the CALIPSOplus project under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. I.M. acknowledges financial support by the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). O.J.C., J.M.R., and K.U. acknowledge EPSRC for studentship support through grant nos. EP/K503162/1 and EP/L505079/1, and EP/L015110/1. This work has been partly performed in the framework of the Nanoscience Foundry and Fine Analysis (NFFA-MIUR, Italy) facility. C.A.H. is grateful to Rice University for their hospitality during a four-month visiting professorship, where part of this work was carried out. Publisher Copyright: © 2019, The Author(s).

PY - 2019/12/1

Y1 - 2019/12/1

N2 - Band inversions are key to stabilising a variety of novel electronic states in solids, from topological surface states to the formation of symmetry-protected three-dimensional Dirac and Weyl points and nodal-line semimetals. Here, we create a band inversion not of bulk states, but rather between manifolds of surface states. We realise this by aliovalent substitution of Nb for Zr and Sb for S in the ZrSiS family of nonsymmorphic semimetals. Using angle-resolved photoemission and density-functional theory, we show how two pairs of surface states, known from ZrSiS, are driven to intersect each other near the Fermi level in NbGeSb, and to develop pronounced spin splittings. We demonstrate how mirror symmetry leads to protected crossing points in the resulting spin-orbital entangled surface band structure, thereby stabilising surface state analogues of three-dimensional Weyl points. More generally, our observations suggest new opportunities for engineering topologically and symmetry-protected states via band inversions of surface states.

AB - Band inversions are key to stabilising a variety of novel electronic states in solids, from topological surface states to the formation of symmetry-protected three-dimensional Dirac and Weyl points and nodal-line semimetals. Here, we create a band inversion not of bulk states, but rather between manifolds of surface states. We realise this by aliovalent substitution of Nb for Zr and Sb for S in the ZrSiS family of nonsymmorphic semimetals. Using angle-resolved photoemission and density-functional theory, we show how two pairs of surface states, known from ZrSiS, are driven to intersect each other near the Fermi level in NbGeSb, and to develop pronounced spin splittings. We demonstrate how mirror symmetry leads to protected crossing points in the resulting spin-orbital entangled surface band structure, thereby stabilising surface state analogues of three-dimensional Weyl points. More generally, our observations suggest new opportunities for engineering topologically and symmetry-protected states via band inversions of surface states.

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DO - 10.1038/s41467-019-13464-z

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ER -

Weyl-like points from band inversions of spin-polarised surface states in NbGeSb

Abstract

Bibliographical note

ASJC Scopus subject areas

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