Multiple types of topological fermions in transition metal silicides

Abstract

Exotic massless fermionic excitations with non-zero Berry flux, other than Dirac and Weyl fermions, could exist in condensed matter systems under the protection of crystalline symmetries, such as spin-1 excitations with 3-fold degeneracy and spin-3/2 Rarita-Schwinger-Weyl fermions. Herein, by using ab initio density functional theory, we show that these unconventional quasiparticles coexist with type-I and type-II Weyl fermions in a family of transition metal silicides, including CoSi, RhSi, RhGe and CoGe, when the spin-orbit coupling (SOC) is considered. Their non-trivial topology results in a series of extensive Fermi arcs connecting projections of these bulk excitations on side surface, which is confirmed by (010) surface electronic spectra of CoSi. In addition, these stable arc states exist within a wide energy window around the Fermi level, which makes them readily accessible in angle-resolved photoemission spectroscopy measurements.

5 pages, 4 figures, Comments are welcome

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• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
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• Studying the Magnetic Properties of CoSi Single Crystals

Cited by in corpus (49)

• Large Fermi Arcs in Unconventional Weyl Semimetal RhSi
• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Double-Weyl phonons in transition-metal monosilicides
• Light-induced emergent phenomena in 2D materials and topological materials
• Angle-resolved photoemission spectroscopy and its application to topological materials
• Topological quantum materials from the viewpoint of chemistry
• Twofold quadruple Weyl nodes in chiral cubic crystals
• Ideal Unconventional Weyl Point in a Chiral Photonic Metamaterial
• Acoustic Higher-Order Weyl Semimetal with Bound Hinge States in the Continuum
• Crystal growth and quantum oscillations in the topological chiral semimetal CoSi
• Quasiparticle Interference Evidence of the Topological Fermi Arc States in Chiral Fermionic Semimetal CoSi
• Chiral fermion reversal in chiral crystals
• Linear optical conductivity of chiral multifold fermions
• Observation of multiple types of topological fermions in PdBiSe
• Direct observation of handedness-dependent quasiparticle interference in the two enantiomers of topological chiral semimetal PdGa
• Weyl phonons in chiral crystals
• An ab-initio study of circular photogalvanic effect in chiral multifold semimetals
• Single crystal growth and magnetoresistivity study of topological semimetal CoSi
• Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
• Topology and symmetry of circular photogalvanic effect in the chiral multifold semimetals: a review
• Spin Hall effect in a spin-1 chiral semimetal
• Topological Semimetals for Scaled Back-End-Of-Line Interconnect Beyond Cu
• Computing observables without eigenstates: applications to Bloch Hamiltonians
• Symmetry driven topological phases in XAgBi (X=Ba,Sr): An Ab-initio hybrid functional calculations
• Quantum oscillations and electronic structures in large Chern number semimetal RhSn
• Spin-1 Weyl Point and Surface Arc State in a Chiral Phononic Crystal
• Broadband optical conductivity of the chiral multifold semimetal PdGa
• Chiral topological metals with multiple types of quasiparticle fermions and large spin Hall effect in the SrGePt family materials
• Symmetry-protected Spinful Magnetic Weyl Nodal Loops and Multi-Weyl Nodes in $5d^n$ Cubic Double Perovskites $(n=1,2)$
• Strain-induced topological charge control in multifold fermion systems
• Influences of spin-orbit coupling on Fermi surfaces and Dirac cones in ferroelectric-like polar metals
• Fermi surface of the chiral topological semimetal CoSi
• Optical conductivity of tilted higher pseudospin Dirac-Weyl cones
• Giant Chern number of a Weyl nodal surface without upper limit
• Transport evidence of triply degenerate nodal semimetal YRh6Ge4
• Fermionic dualities with axial gauge fields
• Noncollinear Magnetic Modulation of Weyl Nodes in Ferrimagnetic Mn${}_3$Ga
• Pressure Engineering of the Dirac Fermions in Quasi-One-Dimensional Tl${}_2$Mo${}_6$Se${}_6$
• Possible quadrupole-order-driven commensurate-incommensurate phase transition in B20 CoGe
• Conservation of chirality at a junction between two Weyl semimetals
• Radio frequency polarization modulation based on an optical frequency comb
• Infrared fixed points of higher-spin fermions in topological semimetals
• Chirality-tunable non-linear Hall effect
• Charge instability of topological Fermi arcs in chiral crystal CoSi
• Collective plasmonic modes in the chiral multifold fermionic material CoSi
• Magnetic Photocurrents in Multifold Weyl Fermions
• Realization of Photonic Charge-2 Dirac Point by Engineering Super-modes in Topological Superlattices
• Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi