Quantum Oscillations in the Type-II Dirac Semimetals: MAl3 (M = V, Nb and Ta)

ORAL

Abstract

Recent work shows that MAl3 (M = V, Nb and Ta) are type-II topological Dirac semimetals with a pair of strong Lorentz-violating Dirac nodes. We synthesized single crystals by using an Al flux method and measured the de Hass-van Alphen effect by using torque magnetomery. From the angular-dependence of the quantum oscillations of MAl3, the geometry of the Fermi surface is identified and found to be consistent with first-principle calculations. The Dirac points are located the Fermi level at about 100 meV, 230 meV and 250 meV in VAl3, NbAl3 and TaAl3, respectively. We also reveal that one of the hole orbits formed by the tilted Dirac cone displays a nontrivial Berry phase π. These results support the existence of tilted Dirac cones above the Fermi level within the VAl3 family.

–

Presenters

  • Kuan-Wen Chen

    National High Magnetic Field Laboratory, Natl. High Magnetic Field Lab, Florida State University, Natl High Magnetic Field Lab

Authors

  • Kuan-Wen Chen

    National High Magnetic Field Laboratory, Natl. High Magnetic Field Lab, Florida State University, Natl High Magnetic Field Lab

  • Xiujun Lian

    National High Magnetic Field Laboratory, DC Facility, Nationall High Magnetic Field Laboratory

  • Yu-Che Chiu

    Natl. High Magnetic Field Lab, Florida State University, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Physics, Florida State University

  • Wangwei Lan

    National High Magnetic Field Laboratory

  • Niraj Aryal

    Natl. High Magnetic Field Lab, Florida State University, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State Univ

  • You Lai

    FSU-NHMFL, National High Magnetic Field Laboratory/Florida State University, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab, NHMFL at Florida State University, Florida State Univ

  • David Graf

    NHMFL Tallahassee, NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, National High Magnetic Field Laboratory/Florida State University, Natl High Magnetic Field Lab, NHMFL at Florida State University, Florida State University, National High Magnetic Field Laboratory, Florida State University, Condensed Matter Science, NHMFL

  • Efstratios Manousakis

    Florida State Univ, Department of Physics and National High Magnetic Field Laboratory, Florida State Unversity, National High Magnetic Field Laboratory, Physics, Florida State Univ, Department of Physics and National High Magnetic Field Laboratory, Florida State University, University of Athens, Panepistimioupolis, Zografos, Athens, Greece; Florida State University, Tallahassee, FL, United States; National High Magnetic Field Laboratory

  • Luis Balicas

    Natl High Magnetic Field Lab, Nat. High Magn. Field Lab., Florida State University, FSU-NHMFL, National High Magnetic Field Lab, National High Magnetic Field Laboratory, Natl. High Magnetic Field Lab, Florida State University, High Field Magnet Lab, 1800 E. Paul Dirac Drive, National High Magnetic Field Laboratory, Natl High Magnetic Field Lab

  • Ryan Baumbach

    National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, NHMFL, National High Magnetic Field Laboratory/Florida State University, Natl High Magnetic Field Lab, NHMFL at Florida State University