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Two-dimensional type-II Dirac fermions in layered oxides

Relativistic massless Dirac fermions can be probed with high-energy physics experiments, but appear also as low-energy quasi-particle excitations in electronic band structures. In condensed matter systems, their massless nature can be protected by crystal symmetries. Classification of such symmetry-...

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Autores principales: Horio, M., Matt, C. E., Kramer, K., Sutter, D., Cook, A. M., Sassa, Y., Hauser, K., Månsson, M., Plumb, N. C., Shi, M., Lipscombe, O. J., Hayden, S. M., Neupert, T., Chang, J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092334/
https://www.ncbi.nlm.nih.gov/pubmed/30108225
http://dx.doi.org/10.1038/s41467-018-05715-2
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author Horio, M.
Matt, C. E.
Kramer, K.
Sutter, D.
Cook, A. M.
Sassa, Y.
Hauser, K.
Månsson, M.
Plumb, N. C.
Shi, M.
Lipscombe, O. J.
Hayden, S. M.
Neupert, T.
Chang, J.
author_facet Horio, M.
Matt, C. E.
Kramer, K.
Sutter, D.
Cook, A. M.
Sassa, Y.
Hauser, K.
Månsson, M.
Plumb, N. C.
Shi, M.
Lipscombe, O. J.
Hayden, S. M.
Neupert, T.
Chang, J.
author_sort Horio, M.
collection PubMed
description Relativistic massless Dirac fermions can be probed with high-energy physics experiments, but appear also as low-energy quasi-particle excitations in electronic band structures. In condensed matter systems, their massless nature can be protected by crystal symmetries. Classification of such symmetry-protected relativistic band degeneracies has been fruitful, although many of the predicted quasi-particles still await their experimental discovery. Here we reveal, using angle-resolved photoemission spectroscopy, the existence of two-dimensional type-II Dirac fermions in the high-temperature superconductor La(1.77)Sr(0.23)CuO(4). The Dirac point, constituting the crossing of [Formula: see text] and [Formula: see text] bands, is found approximately one electronvolt below the Fermi level (E(F)) and is protected by mirror symmetry. If spin-orbit coupling is considered, the Dirac point degeneracy is lifted and the bands acquire a topologically non-trivial character. In certain nickelate systems, band structure calculations suggest that the same type-II Dirac fermions can be realised near E(F).
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spelling pubmed-60923342018-08-16 Two-dimensional type-II Dirac fermions in layered oxides Horio, M. Matt, C. E. Kramer, K. Sutter, D. Cook, A. M. Sassa, Y. Hauser, K. Månsson, M. Plumb, N. C. Shi, M. Lipscombe, O. J. Hayden, S. M. Neupert, T. Chang, J. Nat Commun Article Relativistic massless Dirac fermions can be probed with high-energy physics experiments, but appear also as low-energy quasi-particle excitations in electronic band structures. In condensed matter systems, their massless nature can be protected by crystal symmetries. Classification of such symmetry-protected relativistic band degeneracies has been fruitful, although many of the predicted quasi-particles still await their experimental discovery. Here we reveal, using angle-resolved photoemission spectroscopy, the existence of two-dimensional type-II Dirac fermions in the high-temperature superconductor La(1.77)Sr(0.23)CuO(4). The Dirac point, constituting the crossing of [Formula: see text] and [Formula: see text] bands, is found approximately one electronvolt below the Fermi level (E(F)) and is protected by mirror symmetry. If spin-orbit coupling is considered, the Dirac point degeneracy is lifted and the bands acquire a topologically non-trivial character. In certain nickelate systems, band structure calculations suggest that the same type-II Dirac fermions can be realised near E(F). Nature Publishing Group UK 2018-08-14 /pmc/articles/PMC6092334/ /pubmed/30108225 http://dx.doi.org/10.1038/s41467-018-05715-2 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Horio, M.
Matt, C. E.
Kramer, K.
Sutter, D.
Cook, A. M.
Sassa, Y.
Hauser, K.
Månsson, M.
Plumb, N. C.
Shi, M.
Lipscombe, O. J.
Hayden, S. M.
Neupert, T.
Chang, J.
Two-dimensional type-II Dirac fermions in layered oxides
title Two-dimensional type-II Dirac fermions in layered oxides
title_full Two-dimensional type-II Dirac fermions in layered oxides
title_fullStr Two-dimensional type-II Dirac fermions in layered oxides
title_full_unstemmed Two-dimensional type-II Dirac fermions in layered oxides
title_short Two-dimensional type-II Dirac fermions in layered oxides
title_sort two-dimensional type-ii dirac fermions in layered oxides
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6092334/
https://www.ncbi.nlm.nih.gov/pubmed/30108225
http://dx.doi.org/10.1038/s41467-018-05715-2
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