Observation of Dirac surface states in the hexagonal PtBi2, a possible origin of the linear magnetoresistance

Abstract

The nonmagnetic compounds showing extremely large magnetoresistance are attracting a great deal of research interests due to their potential applications in the field of spintronics. PtBi${}_2$ is one of such interesting compounds showing large linear magnetoresistance (MR) in its both the hexagonal and pyrite crystal structure. We use angle-resolved photoelectron spectroscopy (ARPES) and density functional theory (DFT) calculations to understand the mechanism of liner MR observed in the hexagonal PtBi${}_2$. Our results uncover for the first time linear dispersive surface Dirac states at the $\bar{\Gamma }$-point, crossing Fermi level with node at a binding energy of $\approx$ 900 meV, in addition to the previously reported Dirac states at the $\bar{M}$-point in the same compound. We further notice from our dichroic measurements that these surface states show an asymmetric spectral intensity when measured with left and right circularly polarized light, hinting at a substantial spin polarization of the bands. Following these observations, we suggest that the linear dispersive Dirac states at the $\bar{\Gamma }$ and $\bar{M}$-points are likely to play a crucial role for the linear field dependent magnetoresistance recorded in this compound.

References in corpus (35)

• Titanic Magnetoresistance in WTe2
• Observation of the chiral anomaly induced negative magneto-resistance in 3D Weyl semi-metal TaAs
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Extremely large magnetoresistance and ultrahigh mobility in the topological Weyl semimetal NbP
• Non-saturating magnetoresistance in heavily disordered semiconductors
• Magnetic field-induced insulating behavior in highly oriented pyrolitic graphite
• 3D Dirac semimetals: current materials, design principles and predictions of new materials
• Orbital-Angular-Momentum Based Origin of Rashba-Type Surface Band Splitting
• Signature of strong spin-orbital coupling in the large non-saturating magnetoresistance material WTe2
• Large linear magnetoresistance in Dirac semi-metal Cd3As2 with Fermi surfaces close to the Dirac points
• Observation of a warped helical spin-texture in Bi${}_2$Se${}_3$ from circular dichroism angle-resolved photoemission spectroscopy
• Helicity protected ultrahigh mobility Weyl fermions in NbP
• Anisotropic Magnetotransport and Exotic Longitudinal Linear Magnetoresistance in WTe2 Crystals
• Anisotropic giant magnetoresistance in NbSb2
• Compensated semimetal LaSb with unsaturated magnetoresistance
• Tantalum Monoarsenide: an Exotic Compensated Semimetal
• Electron scattering in tantalum monoarsenide
• Extremely large magnetoresistance in a topological semimetal candidate pyrite PtBi2
• Magnetotransport of single crystalline YSb
• A Novel Quasi-One-Dimensional Topological Insulator in Bismuth Iodide $\beta$-Bi${}_4$I${}_4$
• Magnetotransport of single crystalline NbAs
• Extremely large and significantly anisotropic magnetoresistance in ZrSiS single crystals
• Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3
• Hall-effect within the colossal magnetoresistive semi-metallic state of MoTe2
• Bulk crystal growth and electronic characterization of the 3D Dirac Semimetal Na3Bi
• Universal Magnetic-Field-Driven Metal-Insulator-Metal Transformations in Graphite and Bismuth
• Disorder induced magnetoresistance in a two dimensional electron system
• Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators
• Magnetoresistance and Quantum Oscillations of an Electrostatically Tuned Semimetal-to-Metal Transition in Ultra-Thin WTe2
• MoTe2 : An uncompensated semimetal with extremely large magnetoresistance
• Multiple Fermi pockets revealed by Shubnikov-de Haas oscillations in WTe2
• Giant Linear Magneto-resistance in Nonmagnetic PtBi2
• Synthesis, characterization and physical properties of layered bismuthide PtBi${}_2$
• Unusual Dirac fermions on the surface of noncentrosymmetric $\alpha$ - BiPd superconductor
• Bulk and surface electronic structure of trigonal structured PtBi2 studied by angle-resolved photoemission spectroscopy

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• Rashba-like spin splitting along three momentum directions in trigonal layered PtBi2
• Superconducting Arcs
• Polymorphic PtBi2: Growth, structure and superconducting properties
• Two-dimensional Topological Ferroelectric Metal with Giant Shift Current
• Fragility of Fermi arcs in Dirac semimetals
• Huge linear magnetoresistance due to open orbits in $\gamma$-PtBi${}_2$
• Negative longitudinal magnetoresistance in GaAs quantum wells
• 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
• Fermi arcs dominating the electronic surface properties of trigonal PtBi${}_2$
• Enhanced weak superconductivity in trigonal $\gamma$-PtBi${}_2$
• Electron dynamics in a three-dimensional Brillouin zone analysed by machine learning
• Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi${}_2$
• Massive Dirac fermions in layered BaZnBi${}_2$
• Multiband Quantum Materials