Quantum oscillations in the type-II Dirac semi-metal candidate PtSe2
- Max-Planck-Inst. for Chemical Physics of Solids, Dresden (Germany); Max-Planck-Inst. of Microstructure Physics, Halle (Germany)
- Max-Planck-Inst. for Chemical Physics of Solids, Dresden (Germany)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Max-Planck-Inst. of Microstructure Physics, Halle (Germany)
- Max-Planck-Inst. for Chemical Physics of Solids, Dresden (Germany); Weizmann Inst. of Science, Rehovot (Israel). Dept. of Condensed Matter Physics
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. Here, 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.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE; European Union (EU); German-Israeli Foundation for Scientific Research and Development (GIF); National Science Foundation (NSF)
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1481987
- Report Number(s):
- LA-UR--18-21005
- Journal Information:
- New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 4 Vol. 20; ISSN 1367-2630
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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