Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls

Abstract

In the ferromagnetic (FM) Weyl semimetal CeAlSi both space-inversion and time-reversal symmetries are broken. Our quantum oscillation (QO) data indicate that the FM ordering modifies the Fermi surface topology and also leads to an unusual drop in the QO amplitude. In the FM phase, we find a pressure-induced suppression of the anomalous and the loop Hall effects. This cannot be explained based on the electronic band structure or magnetic structure, both of which are nearly pressure independent. Instead, we show that a simplified model describing the scattering of Weyl fermions off FM domain walls can potentially explain the observed topological features. Our study highlights the importance of domain walls for understanding transport in FM Weyl semimetals.

This article supersedes arXiv:2111.05742 including additional theoretical results. Published in Physical Review Research

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• Kramers nodal lines and Weyl fermions in SmAlSi
• Stripe Helical Magnetism and Two Regimes of Anomalous Hall Effect in NdAlGe
• Topological Hall effect in CeAlGe
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Anomalous Hall effect with plateaus observed in a magnetic Weyl semimetal NdAlGe at low temperatures
• Pressure tuning of intrinsic and extrinsic sources to the anomalous Hall effect in CrGeTe${}_3$
• Activation of anomalous Hall effect and orbital magnetization by domain walls in altermagnets
• Rich unconventional Hall effects in a single quasi-kagome Kondo Weyl semimetal candidate Ce${}_3$TiSb${}_5$
• Topological Hall effect enhanced at magnetic transition fields in a frustrated magnet EuCd${}_2$
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi
• Spin order and dynamics in the topological rare-earth germanide semimetals
• Crystalline electric field excitations in Weyl semimetal \textit{R}AlSi (\textit{R} = Ce, Pr and Nd)
• Isotropic Dirac fermion and anomalous oscillator strength of zeroth Landau level transition
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal