Linear optical conductivity of chiral multifold fermions

Abstract

Chiral multifold fermions are quasiparticles described by higher spin generalizations of the Weyl equation, and are realized as low energy excitations near symmetry protected band crossings in certain chiral crystals. In this work we calculate the linear optical conductivity of all chiral multifold fermions. We show that it is enhanced with respect to that of Weyl fermions with the same Fermi velocity, and features characteristic activation frequencies for each multifold fermion class, providing an experimental fingerprint to detect them. We calculate the conductivity for realistic chiral multifold semimetals by using lattice tight-binding Hamiltonians that match the effective models of multifold fermions at low energies, for space groups 199 and 198. The latter includes RhSi, for which we give quantitative predictions, and also CoSi and AlPt. Our predictions can be tested in absorption or penetration depth measurements, and are necessary to extract the recently proposed quantized photocurrents from experiments.

arXiv comment15 pages, 10 figures. Accepted version

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Cited by in corpus (39)

• Observation of Topological Photocurrents in the Chiral Weyl Semimetal RhSi
• Giant topological longitudinal circular photo-galvanic effect in the chiral multifold semimetal CoSi
• Linear and nonlinear optical responses in the chiral multifold semimetal RhSi
• Optical signatures of multifold fermions in the chiral topological semimetal CoSi
• Kramers Nodal Line Metals
• Optical conductivity of multifold fermions: the case of RhSi
• Four-dimensional semimetals with tensor monopoles: From surface states to topological responses
• Two-dimensional Weyl points and nodal lines in pentagonal materials and their optical response
• Dual Haldane sphere and quantized band geometry in chiral multifold fermions
• Nodal Semimetals: A Survey on Optical Conductivity
• Photoinduced interfacial chiral modes in threefold topological semimetal
• Acoustic spin-1 Weyl semimetal
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• Dynamical conductivity in multiply-degenerate point-nodal semimetal CoSi
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• Broadband optical conductivity of the chiral multifold semimetal PdGa
• Topological Circular Dichroism in Chiral Multifold Semimetals
• Optical conductivity of bilayer dice lattices
• Dynamical polarization, optical conductivity and plasmon mode of a linear triple component fermionic system
• Analysis of the unconventional chiral fermions in a non-centrosymmetric chiral crystal $\text{PtAl}$
• Multiplicative topological semimetals
• Floquet Engineering of Multifold Fermions
• Quantum transport of a spin-1 chiral fermion
• Optical conductivity of the threefold Hopf semimetal
• Electrical conductivity and screening effect of spin-1 chiral fermions scattered by charged impurities
• Winding Topology of Multifold Exceptional Points
• Optical conductivity of triple point fermions
• Band Curvature Effects on Quantum Transport of Spin-1 Chiral Fermion Systems
• Collective plasmonic modes in the chiral multifold fermionic material CoSi
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• Direct Measurement of Helicoid Surface States in RhSi using Nonlinear Optics
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