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

Author(s):Show less -

Piva, M. M. ; Souza, J. C. ; Brousseau-Couture, V. ; Sorn, Sopheak ; Pakuszewski, K. R. ; John, Janas K. ; Adriano, C. ; Cote, M. ; Pagliuso, P. G. ; Paramekanti, Arun ; Nicklas, M.

• Document type: Journal article
• Source: PHYSICAL REVIEW RESEARCH; v. 5, n. 1, p. 16-pg., 2023-01-31.

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. (AU)

• FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Special Projects
• FAPESP's process: 20/12283-0 - Scanning tunneling microscopy in topological nontrivial compounds
• Grantee: Jean Carlo Souza
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 18/11364-7 - Magnetic properties of complex systems with non-trivial topology
• Grantee: Jean Carlo Souza
• Support Opportunities: Scholarships in Brazil - Doctorate