Experimental evidence of type-II Dirac fermions in PtSe2

Abstract

Topological semimetals have attracted extensive research interests for realizing condensed matter physics counterparts of three-dimensional Dirac and Weyl fermions, which were originally introduced in high energy physics. Recently it has been proposed that type-II Dirac semimetal can host a new type of Dirac fermions which break Lorentz invariance and therefore does not have counterpart in high energy physics. Here we report the electronic structure of high quality PtSe${}_2$ crystals to provide direct evidence for the existence of three-dimensional type-II Dirac fermions. A comparison of the crystal, vibrational and electronic structure to a sister compound PtTe${}_2$ is also discussed. Our work provides an important platform for exploring the novel quantum phenomena in the PtSe${}_2$ class of type-II Dirac semimetals.

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Cited by in corpus (65)

• Chemical Principles of Topological Semimetals
• High quality atomically thin PtSe2 films grown by molecular beam epitaxy
• Fermiology and Superconductivity of Topological Surface States in PdTe${}_2$
• Non-topological Origin of the Planar Hall Effect in Type-II Dirac Semimetal NiTe2
• The Optical Properties and Plasmonics of Anisotropic 2-Dimensional Materials
• Low-energy type-II Dirac fermions and spin-polarized topological surface states in transition-metal dichalcogenide NiTe${}_2$
• A comprehensive review on topological superconducting materials and interfaces
• Photocatalytic Properties of Anisotropic $\beta$-PtX${}_2$ (X= S, Se) and Janus $\beta$-PtSSe monolayers
• Observation of Negative THz Photoconductivity in Large Area Type-II Dirac Semimetal PtTe2
• From Type-II Triply Degenerate Nodal Points and Three-Band Nodal Rings to Type-II Dirac Points in Centrosymmetric Zirconium Oxide
• Detailed study on the Fermi surfaces of the type-II Dirac semimetallic candidates PdTe2 and PtTe2
• Approaching the Type-II Dirac Point and Concomitant Superconductivity in Pt-doping Stabilized Metastable 1T-phase IrTe2
• A novel undamped gapless plasmon mode in tilted type-II Dirac semimetal
• Band gap engineering of PtSe2
• Strain-engineering the topological type-II Dirac semimetal NiTe${}_2$
• Two-dimensional antiferromagnetic Dirac fermions in monolayer TaCoTe${}_2$
• Properties and superconductivity in Ti-doped NiTe2 single crystals
• Correlating Nanocrystalline Structure with Electronic Properties in 2D Platinum Diselenide
• Two-dimensional type-II Dirac fermions in layered oxides
• Experimental Progress on Layered Topological Semimetals
• Dirac semimetal phase in the hexagonal LiZnBi
• Galvanomagnetic properties of the putative type-II Dirac semimetal PtTe${}_2$
• A de Hass-van Alphen study of the Type-II Dirac semimetal candidates $A$Te${}_2$ ($A=$ Pt, Pd)
• Bulk Fermi surfaces of the Dirac Type-II Semimetallic Candidates VAl3, NbAl3 and TaAl3
• Two-dimensional type-II Dirac fermions in a LaAlO3/LaNiO3/LaAlO3 quantum well
• Current-Perpendicular-to-Plane Giant Magnetoresistance Effect in van der Waals Heterostructures
• Synthetic non-Abelian gauge fields and gravitomagnetic effects in tilted Dirac cone systems
• Broadband excitation spectrum of bulk crystals and thin layers of PtTe${}_2$
• Dual quantum confinement and anisotropic spin splitting in the multi-valley semimetal PtSe${}_2$
• Enhanced superconductivity in bilayer PtTe${}_2$ by alkali-metal intercalations
• Type-II Dirac states in full Heusler compounds XInPd2 (X = Ti, Zr and Hf)
• Type-II topological metals
• Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2
• A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines
• Giant magnetoresistance, Fermi surface topology, Shoenberg effect and vanishing quantum oscillations in type-II Dirac semimetal candidates MoSi${}_2$ and WSi${}_2$
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• Realization of Practical Eightfold Fermions and Fourfold van Hove Singularity in TaCo${}_2$Te${}_2$
• Condition for the emergence of a bulk Fermi arc in disordered Dirac-fermion systems
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• The study on quantum material WTe2
• Seeded growth of high-quality transition metal dichalcogenide single crystals via chemical vapor transport
• Emergent superconductivity by Re doping in type -II Weyl semimetal NiTe2
• The optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions
• Electronic structure of a Si-containing topological Dirac semimetal CaAl2Si2
• Investigation of structural and magneto-transport properties of PdTe2 single crystals
• Magnetic hourglass fermions: from exhaustive symmetry conditions to high-throughput materials predictions
• Atoms to topological electronic materials: A bedtime story for beginners
• First-principles study on the electrical resistivity in zirconium dichalcogenides with multi-valley bands: mode-resolved analysis of electron-phonon scattering
• Interplay between tilt, disorder, and Coulomb interaction in type-I Dirac fermions
• Majorana corner modes in unconventional monolayers of the 1T-PtSe2 family
• Type-II Dirac line node in strained Na3N
• Inversion symmetry breaking induced triply degenerate points in orderly arranged PtSeTe family materials
• Observation of the Critical State to Multiple-Type Dirac Semimetal Phases in KMgBi
• Systematic analysis for triple points in all magnetic symmorphic systems and symmetry-allowed coexistence of Dirac points and triple points
• Chiral anomaly and positive longitudinal magnetoresistance in the type-II Dirac semimetals $A_x$PdTe${}_2$ (\textit{A} = Cu, Ag)
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• Helicity resolved Raman spectroscopy of mono- and a few-layers thick PtSe${}_2$
• Topological insulating phase arising in transition metal dichalcogenide alloy
• Tilted Dirac superconductor at quantum criticality: Restoration of Lorentz symmetry
• Transport anomalies in the layered compound BaPt4Se6
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• Predicting Defect Stability and Annealing Kinetics in Two-Dimensional PtSe${}_2$ Using Steepest Entropy Ascent Quantum Thermodynamics
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