Reentrant Landau Levels in a Dirac topological insulator

ORAL

Abstract

The quantum limit, where magnetic fields confine carriers to the lowest Landau level, is predicted to host exotic quantum phases arising from strengthened electronic correlations, reduced dimensionality, and increased degeneracy. We report a novel quantization regime realized in the ultra-quantum limit of the narrow-gap Dirac insulator ZrTe5, marked by anomalous magnetoresistance oscillations. These oscillations, measured in ZrTe5 single crystals down to 700 mK and up to 60 T, are distinctly non-1/B periodic and persist for magnetic fields well beyond the quantum limit. In this regime, the competition between Zeeman and cyclotron energies drives a nonlinear evolution and back-bending of Landau levels, causing low-index levels to re-cross the Fermi energy at high fields. This mechanism departs from the standard Lifshitz--Kosevich description and provides a framework to describe how the electronic structure in topological Dirac insulators evolves beyond the quantum limit.

*This work was performed at the National High Magnetic Field Laboratory, which is supported by the National Science Foundation through NSF/DMR-2128556, the State of Florida and the U.S. Department of Energy. The research presented in this article was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project numbers 20230486ECR. Material synthesis and characterization at the University of Washington was supported by the Center on Programmable Quantum Materials, an Energy Frontier Research Center funded by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award DE-SC0019443. S. M. T. was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20230014DR. J. L. J and C. K. R acknowledges grants 2018/08845-3, 2019/24522-2 and 2022/15955-5, São Paulo Research Foundation (FAPESP). J. L. J acknowledges grants CNPq 310065/2021-6. C.K.R., K.R., J.S., and N.H. and data analysis and interpretation were supported by the U.S. Department of Energy "Science of 100 Tesla" BES program

–

Publication: Reentrant Landau Levels in a Dirac topological insulator

Presenters

  • Caue Kaufmann Ribeiro

    • Los Alamos National Laboratory (LANL)

Authors

  • Caue Kaufmann Ribeiro

    • Los Alamos National Laboratory (LANL)

  • Joshua C Mutch

    • University of Washington

  • Qi Jiang

    • University of Washington

  • Joss Ayres-Sims

    • University of Washington

  • KM Rubi

    • Los Alamos National Laboratory (LANL)

  • Christopher A Mizzi

    • Los Alamos National Laboratory (LANL)
    • Los Alamos National Laboratory

  • Elizabeth Peterson

    • Los Alamos National Laboratory (LANL)

  • Danny S Bulmash

    • US Naval Academy

  • John Singleton

    • NHMFL / LANL
    • Los Alamos National Laboratory (LANL)

  • Neil Harrison

    • Los Alamos National Laboratory (LANL)

  • Priscila FS Rosa

    • Los Alamos National Laboratory (LANL)

  • Jianxin Zhu

    • Los Alamos National Laboratory
    • Los Alamos National Laboratory (LANL)

  • Jiun-Haw Chu

    • University of Washington

  • Julio Larrea Jimenez

    • Laboratory for Quantum Matter under Extreme Conditions, Institute of Physics, University of São Paulo, Rua do Matão, 1371, 05508-090, São Paulo, SP, Brazil

  • Sean M Thomas

    • Los Alamos National Laboratory (LANL)
    • Los Alamos National Laboratory

  • Johanna C. Palmstrom

    • Los Alamos National Laboratory (LANL)