Enhanced Correlation Effects in Nodal-line Semimetal ZrSiSe

ORAL

Abstract

Three-dimensional (3D) 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 Dirac dispersion has been extended to lines and loops, with reduced kinetic energy along the line [1]. However, experimental evidence for the predicted enhanced correlations in nodal-line semimetals has been rare. Here we show in ZrSiSe enhanced correlation effects through a combination of optical/magneto-optical spectroscopy and density-functional-theory (DFT) calculations. Near 40% kinetic energy reduction compared to DFT has been observed in ZrSiSe and the averaged Fermi velocity is also renormalized. ZrSiSe is therefore a novel candidate to study correlation-driven physics in Dirac systems as well as strong Berry curvature effects associated with spin-orbit-coupling.

[1] Y. Shao et al, arXiv:1806.01996 (2018)

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Presenters

  • Yinming Shao

    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University

Authors

  • Yinming Shao

    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University

  • Alexander N. Rudenko

    • School of Physics and Technology, Wuhan University
    • Radboud University

  • Jin Hu

    • University of Arkansas
    • Department of Physics and Engineering Physics, Tulane University
    • Department of Physics, University of Arkansas

  • Yanglin Zhu

    • Department of Physics and Engineering Physics, Tulane University
    • Tulane University
    • Physics and Engineering Physics, Tulane University

  • Alexander I. Lichtenstein

    • University of Hamburg
    • Institute for theoretical physics, University of Hamburg, Germany

  • Zhiqiang Mao

    • Pennsylvania State University
    • Physics, Pennsylvania State University
    • Department of Physics and Engineering Physics, Tulane University
    • Physics and Engineering Physics, Tulane University
    • Tulane University

  • Mikhail Katsnelson

    • Theory of Condensed Matter, Radboud University
    • Institute for Molecules and Materials,, Radboud University
    • Radboud University

  • Dimitri Basov

    • Department of Physics, Columbia University in the City of New York
    • Department of Physics, Columbia University, New York 10027
    • department of physics, columbia university
    • Department of Physics, Columbia University
    • Physics, Columbia University
    • Columbia University