Tunable chirality of noncentrosymmetric magnetic Weyl semimetals

Abstract

Even if Weyl semimetals are characterized by quasiparticles with well-defined chirality, exploiting this experimentally is severely hampered by Weyl lattice-fermions coming in pairs with opposite chirality, typically causing the net chirality picked up by experimental probes to vanish. Here we show this issue can be circumvented in a controlled manner when both time-reversal- and inversion- symmetry are broken. To this end, we investigate chirality-disbalance in the carbide family RMC${}_2$ (R a rare-earth and M a transition metal), showing several members to be Weyl semimetals. Using the noncentrosymmetric ferromagnet NdRhC${}_2$ as an illustrating example, we show that an odd number of Weyl nodes can be stabilized at its Fermi surface by properly tilting its magnetization. The tilt direction determines the sign of the resulting net chirality, opening up a simple route to control it.

7 pages, 3 figures, 1 table, and Supplemental Information

References in corpus (8)

• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Berry Curvature, Triangle Anomalies, and the Chiral Magnetic Effect in Fermi Liquids
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Topological Hopf and chain link semimetal states and their application to Co2MnGa (Theory and Materials Prediction)
• The study of magnetic topological semimetals by first principles calculations
• Magnetism and charge density waves in RNiC${}_2$ (R = Ce, Pr, Nd)
• Charge density wave and large non-saturating magnetoresistance in YNiC${}_2$ and LuNiC${}_2$
• Field induced suppression of charge density wave in GdNiC${}_2$

Cited by in corpus (8)

• Large anomalous Hall effect in single crystals of the kagome Weyl ferromagnet Fe${}_3$Sn
• Effect of chirality imbalance on Hall transport of PrRhC${}_2$
• Anisotropic optics and gravitational lensing of tilted Weyl fermions
• Efficiency and Mechanism of Heat Flux Rectification with Non-Reciprocal Surface Waves in Weyl-Semi-Metals
• Stability of Weyl node merging processes under symmetry constraints
• Coexistence of charge density wave and field-tuned magnetic states in TmNiC${}_2$
• Distinct quasiparticle interference patterns for surface impurity scattering on various Weyl semimetals
• Topological Metal-Insulator Transition within the Ferromagnetic state