Chiral fermion reversal in chiral crystals

Abstract

In materials chiral fermions such as Weyl fermions are characterized by nonzero chiral charges, which are singular points of Berry curvature in momentum space. Recently, new types of chiral fermions beyond Weyl fermions have been discovered in structurally chiral crystals CoSi, RhSi and PtAl. Here, we have synthesized RhSn single crystals, which have opposite structural chirality to the CoSi crystals we previously studied. Using angle-resolved photoemission spectroscopy, we show that the bulk electronic structures of RhSn are consistent with the band calculations and observe evident surface Fermi arcs and helical surface bands, confirming the existence of chiral fermions in RhSn. It is noteworthy that the helical surface bands of the RhSn and CoSi crystals have opposite handedness, meaning that the chiral fermions are reversed in the crystals of opposite structural chirality. Our discovery establishes a direct connection between chiral fermions in momentum space and chiral lattices in real space.

18 pages, 4 figures

References in corpus (6)

• Multiple types of topological fermions in transition metal silicides
• 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
• Hear the Sound of Weyl Fermions

Cited by in corpus (23)

• Topological quantum materials from the viewpoint of chemistry
• Direct observation of handedness-dependent quasiparticle interference in the two enantiomers of topological chiral semimetal PdGa
• Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
• Chirality locking charge density waves in a chiral crystal
• Helicity-tunable spin Hall and spin Nernst effects in unconventional chiral fermion semimetals XY (X=Co, Rh; Y=Si, Ge)
• Quantum oscillations and electronic structures in large Chern number semimetal RhSn
• Topological Circular Dichroism in Chiral Multifold Semimetals
• Analysis of the unconventional chiral fermions in a non-centrosymmetric chiral crystal $\text{PtAl}$
• Charge order induced Dirac pockets in the nonsymmorphic crystal TaTe${}_4$
• Chiral Floquet Engineering on Topological Fermions in Chiral Crystals
• Shubnikov-de Haas and de Haas-van Alphen oscillation in Czochralski grown CoSi single crystal
• Electronic and dynamical properties of cobalt monogermanide CoGe phases under pressure
• Intrinsic Orbital Origin for the Chirality-Dependent Nonlinear Planar Hall Effect of Topological Nodal Fermions in Chiral Crystals
• Electrical conductivity and screening effect of spin-1 chiral fermions scattered by charged impurities
• Chiral phononic and electronic edge modes of EuPtSi
• Chiral Topological Phononic Quasiparticles in Enantiomeric Crystals SrSi${}_2$ and BaSi${}_2$
• Multiple types of unconventional quasiparticles in the chiral crystal CsBe${}_2$F${}_5$
• Theory of Photocurrent and High-Harmonic Generation with Chiral Fermions
• High-chirality and multiquaternion Weyl nodes in hexagonal ReO${}_3$
• Spinless topological chirality from Umklapp scattering in twisted 3D structures
• Phonon Weyl points and chiral edge modes with unconventional Fermi arcs in NbSi${}_2$
• Physical properties of RhGe and CoGe single crystals synthesized under high pressure
• Orbital magnetization as the origin of the nonlinear Hall effect