Electronic Structure of Quasi-1D Topological Nodal-line Semimetals

ORAL

Abstract

Nodal line semimetals (NLSMs) are symmetry-protected topological materials with Dirac/Weyl-type band crossings that extend into loops or lines in reciprocal space. These materials often show novel transport properties, including highly-anisotropic magnetoresistance, quantum oscillations, and non-zero Berry curvatures [1-2]. Using angle-resolved photoemission spectroscopy (ARPES) and density-functional-theory calculations, we have shown that quasi-1D structure tellurides TaXTe5 (X = Ni, Pt) are NLSMs, hosting Dirac-like surface states and nodal lines with quasi-2D electronic structures. These Dirac-like states exhibit complex dichroism in ARPES. We have also shown that when electrons are doped into these systems, the Fermi surfaces change dramatically and flat-band-like electronic states appear near the Fermi energy (EF). The energy position of the flat-band is also highly tunable by controlling the doping. Flat-bands around EF may enhance electronic correlations that can lead to novel transport properties.

[1] Chen et al., Phys. Rev. B 103, 035105 (2021)

[2] Jiao et al., Phys. Rev. B 103, 125150 (2021)

*This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Contract No. DE-SC0012704. The work at Ames was supported by the U.S. Department of Energy under Contract No. DE-AC02-07CH11358. This work was also supported in part by Center for Spintronics Research Network, Tohoku University, Japan.

–

Presenters

  • Asish K Kundu

    • Brookhaven National Laboratory

Authors

  • Asish K Kundu

    • Brookhaven National Laboratory

  • Renu Choudhary

    • Ames National Laboratory

  • Santanu Pakhira

    • Ames National Laboratory, Iowa State University
    • Ames National Laboratory

  • Tufan Roy

    • Research Institute of Electrical Communication, Tohoku University, Japan

  • Turgut Yilmaz

    • Brookhaven National Laboratory

  • Elio Vescovo

    • Brookhaven National Laboratory
    • Brookhaven National Lab

  • Masafumi Shirai

    • Research Institute of Electrical Communication & Center for Science and Innovation in Spintronics, Tohoku University, Japan

  • David C Johnston

    • Ames National Laboratory & Iowa State University

  • Abhay N Pasupathy

    • Brookhaven National Laboratory & Columbia University
    • Columbia University

  • Tonica Valla

    • Brookhaven National Laboratory