Bulk and surface electronic structure of trigonal structured PtBi2 studied by angle-resolved photoemission spectroscopy

Abstract

PtBi2 with a layered trigonal crystal structure was recently reported to exhibit an unconventional large linear magnetoresistance, while the mechanism involved is still elusive. Using high resolution angle-resolved photoemission spectroscopy, we present a systematic study on its bulk and surface electronic structure. Through careful comparison with first-principle calculations, our experiment distinguishes the low-lying bulk bands from entangled surface states, allowing the estimation of the real stoichiometry of samples. We find significant electron doping in PtBi2, implying a substantial Bi deficiency induced disorder therein. We discover a Dirac-cone-like surface state on the boundary of the Brillouin zone, which is identified as an accidental Dirac band without topological protection. Our findings exclude quantum-limit-induced linear band dispersion as the cause of the unconventional large linear magnetoresistance.

5 pages, 5 figures

References in corpus (9)

• Topological Insulators with Inversion Symmetry
• Non-saturating magnetoresistance in heavily disordered semiconductors
• Linear magnetoresistance caused by mobility fluctuations in the n-doped Cd3As2
• Anisotropic Dirac fermions in a Bi square net of SrMnBi2
• Signature of strong spin-orbital coupling in the large non-saturating magnetoresistance material WTe2
• Magnetic Field Effects on Transport Properties of PtSn4
• Non-saturating magnetoresistance of inhomogeneous conductors: comparison of experiment and simulation
• Synthesis, characterization and physical properties of layered bismuthide PtBi${}_2$
• Giant Linear Magneto-resistance in Nonmagnetic PtBi2

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• Fermi Surface and Carriers Compensation of pyrite-type PtBi${}_2$ Revealed by Quantum Oscillations
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi${}_2$
• Electron dynamics in a three-dimensional Brillouin zone analysed by machine learning