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.

–

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