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)

–

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