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Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor

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  • Michihiro Hirata

    (University of Tokyo
    Laboratoire National des Champs Magnétiques Intenses, UPR 3228 CNRS, EMFL, UGA, UPS and INSA
    Present address: Institute for Materials Research, Tohoku University, Aoba-ku, Sendai 980-8577, Japan)

  • Kyohei Ishikawa

    (University of Tokyo)

  • Kazuya Miyagawa

    (University of Tokyo)

  • Masafumi Tamura

    (Faculty of Science and Technology, Tokyo University of Science)

  • Claude Berthier

    (Laboratoire National des Champs Magnétiques Intenses, UPR 3228 CNRS, EMFL, UGA, UPS and INSA)

  • Denis Basko

    (Université Grenoble Alpes and CNRS, Laboratoire de Physique et Modélisation des Milieux Condensés UMR 5493)

  • Akito Kobayashi

    (Nagoya University)

  • Genki Matsuno

    (Nagoya University)

  • Kazushi Kanoda

    (University of Tokyo)

Abstract

The Coulomb interaction among massless Dirac fermions in graphene is unscreened around the isotropic Dirac points, causing a logarithmic velocity renormalization and a cone reshaping. In less symmetric Dirac materials possessing anisotropic cones with tilted axes, the Coulomb interaction can provide still more exotic phenomena, which have not been experimentally unveiled yet. Here, using site-selective nuclear magnetic resonance, we find a non-uniform cone reshaping accompanied by a bandwidth reduction and an emergent ferrimagnetism in tilted Dirac cones that appear on the verge of charge ordering in an organic compound. Our theoretical analyses based on the renormalization-group approach and the Hubbard model show that these observations are the direct consequences of the long-range and short-range parts of the Coulomb interaction, respectively. The cone reshaping and the bandwidth renormalization, as well as the magnetic behaviour revealed here, can be ubiquitous and vital for many Dirac materials.

Suggested Citation

  • Michihiro Hirata & Kyohei Ishikawa & Kazuya Miyagawa & Masafumi Tamura & Claude Berthier & Denis Basko & Akito Kobayashi & Genki Matsuno & Kazushi Kanoda, 2016. "Observation of an anisotropic Dirac cone reshaping and ferrimagnetic spin polarization in an organic conductor," Nature Communications, Nature, vol. 7(1), pages 1-14, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12666
    DOI: 10.1038/ncomms12666
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