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Two-dimensional type-II Dirac fermions in layered oxides
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.;Harvard Univ, Dept Phys, Cambridge, MA 02138 USA..
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 3252Article in journal (Refereed) Published
Abstract [en]

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 La1.77Sr0.23CuO4. The Dirac point, constituting the crossing of d(x2-y2) and d(z2) 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 EF.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 9, article id 3252
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Physical Sciences
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URN: urn:nbn:se:kth:diva-233593DOI: 10.1038/s41467-018-05715-2ISI: 000441518800006PubMedID: 30108225Scopus ID: 2-s2.0-85051659995OAI: oai:DiVA.org:kth-233593DiVA, id: diva2:1242349
Note

QC 20180828

Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved

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