Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb${}_2$

Abstract

Interplay between magnetism and electronic band topology is of central current interest in topological matter research. We use quantum oscillations as powerful tool to probe the evolution of band topology in the Dirac semimetal EuMnSb${}_2$. The Eu local 4f magnetic moments display different antiferromagnetic states below 25 K and a field-polarized phase above 16 T. Upon cooling from 65 K into the field-polarized state, an exotic temperature dependent shift of oscillation peaks arises, accompanied by the development of non-zero Berry phase and a huge unconventional splitting of the oscillations. Band-structure calculations confirm the change from trivial to non-trivial band topology induced by the ferromagnetic Eu state, classifying EuMnSb${}_2$ as unique magnetic topological semimetal.

Spin degeneracy splitting of the Dirac band evidenced by high field SdH oscillations; Accepted for publication as Letter in PRB

References in corpus (9)

• Restoring the density-gradient expansion for exchange in solids and surfaces
• Generalized gradient approximation for solids and their surfaces
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Nontrivial Berry phase in magnetic BaMnSb2 semimetal
• Observation of two-dimensional Fermi surface and Dirac dispersion in YbMnSb${}_2$
• Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb${}_2$
• Crystal growth, microstructure and physical properties of SrMnSb${}_2$
• Canted Antiferromagnetic phases in the layered candidate Weyl material EuMnSb${}_2$

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• Interplay of short-range bond order and A-type antiferromagnetic order in metallic triangular lattice GdZn${}_3$P${}_3$
• Mapping the three-dimensional fermiology of the triangular lattice magnet EuAg${}_4$Sb${}_2$
• Light-element and purely charge-based topological materials