Creating Weyl nodes and controlling their energy by magnetization rotation

Abstract

As they do not rely on the presence of any crystal symmetry, Weyl nodes are robust topological features of an electronic structure that can occur at any momentum and energy. Acting as sinks and sources of Berry curvature, Weyl nodes have been predicted to strongly affect the transverse electronic response, like in the anomalous Hall or Nernst effects. However, to observe large anomalous effects the Weyl nodes need to be close to or at the Fermi-level, which implies the band structure must be tuned by an external parameter, e.g. chemical doping or pressure. Here we show that in a ferromagnetic metal tuning of the Weyl node energy and momentum can be achieved by rotation of the magnetization. Taking Co${}_3$Sn${}_2$S${}_2$ as an example, we use electronic structure calculations based on density-functional theory to show that not only new Weyl fermions can be created by canting the magnetization away from the easy axis, but also that the Weyl nodes can be driven exactly to the Fermi surface. We also show that the dynamics in energy and momentum of the Weyl nodes strongly affect the calculated anomalous Hall and Nernst conductivities.

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Cited by in corpus (48)

• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Magnetism and anomalous transport in the Weyl semimetal PrAlGe: Possible route to axial gauge fields
• Anomalous Hall and Nernst effects in epitaxial films of topological kagome magnet Fe3Sn2
• Plethora of tunable Weyl fermions in kagome magnet Fe3Sn2 thin films
• Observation of a phase transition within the domain walls of ferromagnetic Co3Sn2S2
• First-principles investigation of magnetic and transport properties in hole-doped shandite compounds Co${}_3$In${}_x$Sn${}_{2-x}$S${}_2$
• Piezospintronic effect in antiperovskite Mn${}_3$GaN
• Manipulation of Dirac band curvature and momentum-dependent g-factor in a kagome magnet YMn6Sn6
• Evidence of orbit-selective electronic kagome lattice with planar flat-band in correlated paramagnetic YCr6Ge6
• Large anomalous Hall effect in single crystals of the kagome Weyl ferromagnet Fe${}_3$Sn
• Magnetic-field modulation of topological electronic states and emergent magneto-transport in a magnetic Weyl semimetal
• Tunable chirality of noncentrosymmetric magnetic Weyl semimetals
• The magnetic structure of the topological semimetal Co${}_3$Sn${}_2$S${}_2$
• New insight into tuning magnetic phases of $R$Mn${}_6$Sn${}_6$ kagome metals
• Hidden spin-texture at topological domain walls drive exchange bias in a Weyl semimetal
• Effect of chirality imbalance on Hall transport of PrRhC${}_2$
• Perovskite-type YRh${}_3$B with multiple types of nodal point and nodal line states
• Chirality flip of Weyl nodes and its manifestation in strained MoTe${}_2$
• Chemical-substitution-driven giant anomalous Hall and Nernst effects in magnetic cubic Heusler compounds
• Horizon physics of quasi-one-dimensional tilted Weyl cones on a lattice
• Observation of an unexpected negative magnetoresistance in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Pressure-induced creation and annihilation of Weyl points in Td- and 1T"-Mo0.5W0.5Te2
• Sixfold fermion near the Fermi level in cubic PtBi2
• Spin structure and dynamics of the topological semimetal Co${}_3$Sn${}_{2-x}$In${}_x$S${}_2$
• Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions
• Tuning the electronic band structure in a kagome ferromagnetic metal via magnetization
• Anisotropic optics and gravitational lensing of tilted Weyl fermions
• Unravelling the origin of the peculiar transition in the magnetically ordered phase of the Weyl semimetal Co3Sn2S2
• Topological transitions by magnetization rotation in kagome monolayers of ferromagnetic Weyl semimetal Co-based shandite
• Intrinsic torques emerging from anomalous velocity in magnetic textures
• Effective model analysis of intrinsic spin Hall effect with magnetism in stacked-kagome Weyl semimetal Co3Sn2S2
• Chiral gauge field in fully-spin polarized Weyl semimetal with magnetic domain walls
• Neutron scattering off Weyl semimetals
• Stability of Weyl node merging processes under symmetry constraints
• Discovery of terahertz-frequency orbitally-coupled magnons in a kagome ferromagnet
• Tunable chiral symmetry breaking in symmetric Weyl materials
• Weyl points and anomalous transport effects tuned by the Fe doping in Mn${}_3$Ge Weyl semimetal
• Sign competing sources of Berry curvature and anomalous Hall conductance humps in topological ferromagnets
• Casimir radiation with Weyl semimetals
• Tunable Anomalous Hall Effect in a Kagome Ferromagnetic Weyl Semimetal
• Symmetry-adapted models for multifold fermions with spin-orbit coupling
• Probing emergent axion electrodynamics with waveguide apparatus
• Electronic and optical properties of ternary kagome Rb2Ni3S4: a density functional study
• Doping Dependence of the in-Plane Transition in Co${}_3$Sn${}_2$S${}_2$
• Quantum dynamics in 1D lattice models with synthetic horizons
• The orbital-driven topological phase transition and planar Hall responses in ternary tellurides Weyl semi-metals
• Interplay of Tilt and Axion Fields in Topological Superconductors: Anisotropy in the Meissner Effect
• Magnetization-Tunable Topological Phase Transitions in Ferromagnetic Kagome Monolayers of Co${}_3$X${}_3$Y${}_2$ ($X=\mathrm{Sn},\mathrm{Pb}$; $Y=\mathrm{S},\mathrm{Se}$)