Quantum Oscillations at Integer and Fractional Landau Level Indices in ZrTe5

ORAL

Abstract

A three-dimensional (3D) Dirac semimetal (DS) is an analogue of graphene, but with linear energy dispersion in all (three) momentum directions. We report here the results in exfoliated ZrTe$_{\mathrm{5}}$ thin flakes from the studies of scanning transmission electron microscopy and low temperature magneto-transport measurements. Several unique results were observed. First, a $\pi $ Berry phase was obtained from the Landau fan diagram. Second, the longitudinal resistivity shows linear magnetic field dependence. Most surprisingly, quantum oscillations were also observed at fractional Landau level indices N $=$ 5/3 and 7/5, demonstrating strong electron-electron interaction effects in ZrTe$_{\mathrm{5}}$.

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Authors

  • Wenlong Yu

    Sandia National Laboratories, Albuquerque, New Mexico 87185, USA

  • Yuxuan Jiang

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA, School of physics, Georgia Institute of Technology

  • Jeremy Yang

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

  • Zhiling Dun

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA

  • Haidong Zhou

    Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA, University of Tennessee, University of Tennessee, Knoxville, University of Tennessee,Knoxville, TN 37996, USA, University of Tennessee, Knoxville, National High Magnetic Field Laboratory

  • Zhigang Jiang

    School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

  • Ping Lu

    Sandia National Laboratories, Albuquerque, New Mexico 87185, USA, Sandia National Laboratories

  • W. Pan

    Sandia National Laboratories, Albuquerque, New Mexico 87185, USA, Sandia National Labs