Quadratic Fermi node in a 3D strongly correlated semimetal

DOI DOI PDF Web Site PubMed 被引用文献36件 参考文献41件 オープンアクセス

書誌事項

公開日
2015-12-07
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0
  • https://creativecommons.org/licenses/by/4.0
DOI
  • 10.1038/ncomms10042
  • 10.48550/arxiv.1510.07977
公開者
Springer Science and Business Media LLC

説明

<jats:title>Abstract</jats:title><jats:p>Strong spin–orbit coupling fosters exotic electronic states such as topological insulators and superconductors, but the combination of strong spin–orbit and strong electron–electron interactions is just beginning to be understood. Central to this emerging area are the 5<jats:italic>d</jats:italic> transition metal iridium oxides. Here, in the pyrochlore iridate Pr<jats:sub>2</jats:sub>Ir<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub>, we identify a non-trivial state with a single-point Fermi node protected by cubic and time-reversal symmetries, using a combination of angle-resolved photoemission spectroscopy and first-principles calculations. Owing to its quadratic dispersion, the unique coincidence of four degenerate states at the Fermi energy, and strong Coulomb interactions, non-Fermi liquid behaviour is predicted, for which we observe some evidence. Our discovery implies that Pr<jats:sub>2</jats:sub>Ir<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub> is a parent state that can be manipulated to produce other strongly correlated topological phases, such as topological Mott insulator, Weyl semimetal, and quantum spin and anomalous Hall states.</jats:p>

収録刊行物

  • Nature Communications

    Nature Communications 6 (1), 10042-, 2015-12-07

    Springer Science and Business Media LLC

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