Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2

Yang H, Schmidt M, Suess V, Chan M, Balakirev FF, Mcdonald RD, Parkin SSP, Felser C, Yan B, Moll PJW (2018)

Publication Type: Journal article

Publication year: 2018

Journal

New Journal of Physics Institute of Physics: Open Access Journals / Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft

Book Volume: 20

Article Number: 043008

Journal Issue: 4

DOI: 10.1088/1367-2630/aab32f

Abstract

Three-dimensional topological semi-metals carry quasiparticle states that mimic massless relativistic Dirac fermions, elusive particles that have never been observed in nature. As they appear in the solid body, they are not bound to the usual symmetries of space-time and thus new types of fermionic excitations that explicitly violate Lorentz-invariance have been proposed, the so-called type-II Dirac fermions. We investigate the electronic spectrum of the transition-metal dichalcogenide PtSe2 by means of quantum oscillation measurements in fields up to 65 T. The observed Fermi surfaces agree well with the expectations from band structure calculations, that recently predicted a type-II Dirac node to occur in this material. A hole- and an electron-like Fermi surface dominate the semi-metal at the Fermi level. The quasiparticle mass is significantly enhanced over the bare band mass value, likely by phonon renormalization. Our work is consistent with the existence of type-II Dirac nodes in PtSe2, yet the Dirac node is too far below the Fermi level to support free Dirac-fermion excitations.

Involved external institutions

Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) National High Magnetic Field Laboratory (MagLab) US United States (USA) (US) Max-Planck-Institut für Mikrostrukturphysik (MSP) / Max Planck Institute for Microstructure Physics DE Germany (DE)

How to cite

APA:

Yang, H., Schmidt, M., Suess, V., Chan, M., Balakirev, F.F., Mcdonald, R.D.,... Moll, P.J.W. (2018). Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2. New Journal of Physics, 20(4). https://doi.org/10.1088/1367-2630/aab32f

MLA:

Yang, Hao, et al. "Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2." New Journal of Physics 20.4 (2018).

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