Mapping Domain Wall Topology in the Magnetic Weyl Semimetal CeAlSi

Abstract

We report full vector mapping of local magnetization in CeAlSi, a Weyl semimetal in which both inversion and time-reversal symmetries are broken. The vector maps reveal unanticipated features both within domains and at their boundaries. Boundaries between domains form two kinds of walls with distinct topology and therefore different interactions with Weyl fermions. Domain walls aligned along the tetragonal axes, e.g. (100), exhibit emergent chirality forbidden by the bulk space group, while diagonal walls are non-chiral. Within the domains, we observe that the previously reported set of four easy axes aligned along the in-plane diagonals of the tetragonal structure actually split to form an octet with decreasing temperature below the magnetic transition. All the above phenomena are ultimately traced to the noncollinear magnetic structure of CeAlSi.

5+8 pages, 4+3 figures

References in corpus (3)

• Magnetism and anomalous transport in the Weyl semimetal PrAlGe: Possible route to axial gauge fields
• Magnetic textures and dynamics in magnetic Weyl semimetals
• Magnetic description of the Fermi arc in type-I and type-II Weyl semimetals

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• Structural characterization of the candidate Weyl semimetal CeGaGe
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• Probing domain wall dynamics in magnetic Weyl semimetals via the non-linear anomalous Hall effect
• Zone-selection effect of photoelectron intensity distributions in a nonsymmorphic system RAlSi (R : Ce and Nd)
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