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Electronic Correlations in Nodal-line Semimetals

ORAL

Abstract

Dirac fermions with highly-dispersive linear bands are usually considered weakly correlated, due to relatively large bandwidths (W) compared to Coulomb interactions (U). With the discovery of nodal-line semimetals, the notion of Dirac point has been extended to lines and loops in the momentum space [1]. The anisotropy associated with nodal-line structure gives rise to greatly reduced kinetic energy along the line. However, experimental evidence for anticipated enhanced correlations in nodal-line semimetals is sparse. Here we report on prominent correlation effects in a nodal-line semimetal compound ZrSiSe [2] through a combination of optical spectroscopy and density-functional-theory calculations. We observed two fundamental spectroscopic hallmarks of electronic correlations: strong reduction (1/3) of the free carrier Drude weight and of the Fermi velocity compared to predictions of density functional band theory. The renormalization of Fermi velocity can be further controlled with external magnetic field. ZrSiSe therefore offers the rare opportunity to investigate correlation-driven physics in a Dirac system.

[1] Y. Shao, Z. Sun, et al, Proceedings of the National Academy of Sciences 116,1168 (2019)
[2] Y. Shao et al, Nature Physics 16, 636–641 (2020)

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Presenters

  • Yinming Shao

    Department of Physics, Columbia University, Columbia Univ, Columbia University

Authors

  • Yinming Shao

    Department of Physics, Columbia University, Columbia Univ, Columbia University

  • Alexander N. Rudenko

    Institute for Molecules and Materials, Radboud University, Nijmegen, Netherlands, Wuhan University

  • Jin Hu

    University of Arkansas, The University of Arkansas

  • Zhiyuan Sun

    Columbia University, Department of Physics, Columbia University, Columbia Univ

  • Yanglin Zhu

    The Pennsylvania State University, Physics, Penn State University, Pennsylvania State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University

  • Seongphill Moon

    National High Magnetic Field Laboratory

  • Andrew Millis

    Columbia University, Department of Physics, Columbia University, Flatiron Institute, Columbia Univ, Center for Computational Quantum Physics, Flatiron Institute, Flatiron Institute; Columbia Univ., Columbia University and Center for Computational Quantum Physics, Flatiron Institute

  • Shengjun Yuan

    Wuhan University

  • Alexander I. Lichtenstein

    Universität Hamburg, University of Hamburg

  • Dmitry Smirnov

    National High Magnetic Field Lab, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory, Tallahassee, Florida

  • Zhiqiang Mao

    Pennsylvania State University, Department of Physics, Penn State University, The Pennsylvania State University, Penn State University, Physics, Penn State University, Department of Physics, Pennsylvania State University, Department of Physics, The Pennsylvania State University, Physics, The Pennsylvania State University, Physics, Pennsylvania State University, Department of Materials Science and Engineering, Pennsylvania State University

  • Mikhail Katsnelson

    Radboud University

  • Dmitri Basov

    Columbia University, Department of Physics, Columbia University, Physics, Columbia University, Columbia Univ