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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Cited by in corpus (131)

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• Topological Materials Discovery from Crystal Symmetry
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• Ideal Unconventional Weyl Point in a Chiral Photonic Metamaterial
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• Quasiparticle Interference Evidence of the Topological Fermi Arc States in Chiral Fermionic Semimetal CoSi
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• Linear optical conductivity of chiral multifold fermions
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• Complete classification of band nodal structures
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• Circular dichroism as a probe for topology in three-dimensional semimetals
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• Quantum Oscillations of the Quasiparticle Lifetime in a Metal
• Theory of Difference Frequency Quantum Oscillations
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• Photogalvanic response in multi-Weyl semimetals
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