Anisotropic Giant Planar Hall Effect in type-II Weyl Semimetals

ORAL

Abstract

Recently, giant planar Hall effect originating from chiral anomaly, which is related to the chiral Landau levels, has been predicted and realized in nonmagnetic Dirac/Weyl semimetals. WTe2 is considered to be an intriguing type-II Weyl semimetal with its Weyl cone tilted due to its broken inversion symmetry. Here, we report the observation in WTe2 of the giant planar Hall resistivity that shows a B2 magnetic-field dependences as predicted by theory. Most importantly, we observed a highly anisotropic planar Hall resistivity when the current flows along a- and b-axis of WTe2. The planar Hall resistivity at low temperatures with current flowing along b-axis is almost twice of that along a-axis, because the chiral Landau levels and chiral anomaly are well-defined (or absent) when the magnetic field is parallel (or perpendicular) to the tilting direction (b-axis) of Weyl cone in WTe2.

*It is funded by Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery grant RGPIN-04178, and Ontario Early Researcher Award. This work is also funded by King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) under the Award No. CRF-2015-SENSORS-2709 (KAUST) and CRF-2015-2626-RG4.

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Presenters

  • Peng Li

    • Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo

Authors

  • Peng Li

    • Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo

  • Chenhui Zhang

    • Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST)
    • Physical Science and Engneering, King Abdullah University of Science and Technology
    • King Abdullah University of Science and Technology

  • George Nichols

    • Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo
    • University of Waterloo

  • Long Chen

    • Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo

  • Guoxing Miao

    • Institute for Quantum Computing, University of Waterloo
    • Electrical and Computer Engineering, University of Waterloo
    • IQC, University of Waterloo
    • Institute for Quantum Computing, Department of Electrical and Computer Engineering, University of Waterloo
    • University of Waterloo

  • Xixiang Zhang

    • King Abdullah University of Science and Technology
    • Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST)
    • Physical Science and Engneering, King Abdullah University of Science and Technology