Observation of Fermi arcs and Weyl nodes in a non-centrosymmetric magnetic Weyl semimetal

Abstract

Weyl semimetal (WSM), a novel state of quantum matter, hosts Weyl fermions as emergent quasiparticles resulting from the breaking of either inversion or time-reversal symmetry. Magnetic WSMs that arise from broken time-reversal symmetry provide an exceptional platform to understand the interplay between magnetic order and Weyl physics, but few WSMs have been realized. Here, we identify CeAlSi as a new non-centrosymmetric magnetic WSM via angle-resolved photoemission spectroscopy (ARPES) and first-principles, density-functional theory based calculations. Our surface-sensitive vacuum ultraviolet ARPES data confirms the presence of surface Fermi arcs as, the smoking gun evidence for the existence of the Weyl semimetallic state in CeAlSi. We also observe bulk Weyl cones in CeAlSi using bulk-sensitive soft-X-ray ARPES measurements. In addition, Ce 4f at bands are found near the Fermi level, indicating that CeAlSi is a unique platform for investigating exotic quantum phenomena resulting from the interaction of topology, magnetism and electronic correlations.

12 pages, 4 figures; supplementary information included

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Cited by in corpus (20)

• Topological features in the ferromagnetic Weyl semimetal CeAlSi: Role of domain walls
• Tuning the nontrivial topological properties of the Weyl semimetal CeAlSi
• Kramers nodal lines and Weyl fermions in SmAlSi
• Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
• GdAlSi: An antiferromagnetic topological Weyl semimetal with non-relativistic spin splitting
• Nonlinear optical diode effect in a magnetic Weyl semimetal
• Pushing an Altermagnet to the Ultimate 2D Limit: Evidence of Symmetry Breaking in Monolayers of GdAlSi
• Optical signatures of type-II Weyl fermions in the noncentrosymmetric semimetals $R$AlSi ($R$=La, Ce, Pr, Nd, Sm)
• Diverse electronic landscape of the kagome metal YbTi3Bi4
• Non-Hermitian Boundary in a Surface Selective Reconstructed Magnetic Weyl Semimetal
• Electronic Structure of a Nodal Line Semimetal Candidate TbSbTe
• Weyl nodes and Kondo interaction in noncentrosymmetric semimetals RGaGe (R=La, Ce and Pr) with long Fermi arcs
• Structural characterization of the candidate Weyl semimetal CeGaGe
• Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi
• Crystalline electric field excitations in Weyl semimetal \textit{R}AlSi (\textit{R} = Ce, Pr and Nd)
• Electronic band structure of a nodal line semimetal candidate ErSbTe
• Floquet composite Dirac semimetals
• Zone-selection effect of photoelectron intensity distributions in a nonsymmorphic system RAlSi (R : Ce and Nd)
• Incommensurate magnetic order drives singular angular magnetoresistance in a Weyl semimetal
• Diverse electronic topography in a distorted kagome metal LaTi3Bi4