Correlation Induced Magnetic Topological Phases in Mixed-Valence Compound SmB6
arXiv:2305.02454 · doi:10.1103/PhysRevResearch.5.L042028
Abstract
SmB6 is a mixed-valence compound with flat f-electron bands that have a propensity to magnetism. Here, using a realistic Gamma8 quartet model, we investigate the dynamical spin susceptibility and describe the in-gap collective mode observed in neutron scattering experiments. We show that as the Sm valence increases with pressure, the magnetic correlations enhance and SmB6 undergoes a first-order phase transition into a metallic antiferromagnetic state, whose symmetry depends on the model parameters. The magnetic orderings give rise to distinct band topologies: while the A-type order leads to an overlap between valence and conduction bands in the form of Dirac nodal lines, the G-type order has a negative indirect gap with weak Z2 indices. We also consider the spin polarized phase under a strong magnetic field, and find that it exhibits Weyl points as well as nodal lines close to the Fermi level. The magnetic phases show markedly different surface states and tunable bulk transport properties, with important implications for experiments. Our theory predicts that a magnetic order can be stabilized also by lifting the Gamma8 cubic symmetry, thus explaining the surface magnetism reported in SmB6.
arXiv commentpublished version, Supplementary Material included
References in corpus (33)
- Classification of topological quantum matter with symmetries
- Photovoltaic Hall effect in graphene
- Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
- Topological Kondo Insulators
- Antiferromagnetic topological insulators
- Topological semi-metals with line nodes and drumhead surface states
- Surface electronic structure of the topological Kondo insulator candidate correlated electron system SmB6
- Correlated Topological Insulators with Mixed Valence
- Topological Mirror Superconductivity
- Type-II nodal loops: theory and material realization
- Giant spontaneous Hall effect in a nonmagnetic Weyl-Kondo semimetal
- Topological semimetals protected by off-centered symmetries in nonsymmorphic crystals
- Excitons in topological Kondo insulators - theory of thermodynamic and transport anomalies in SmB
- Interaction Driven Subgap Spin Exciton in the Kondo Insulator SmB6
- Topological transport in Dirac nodal-line semimetals
- DMFT reveals the non-Hermitian topology in heavy-fermion systems
- One-dimensional edge state transport in a topological Kondo insulator
- Möbius Kondo Insulators
- Topological band crossings in hexagonal materials
- Magnetotransport Measurements of the Surface States of Samarium Hexaboride using Corbino Structures
- Hysteretic Magnetotransport in SmB6 at Low Magnetic Fields
- CeRuSn: a strongly correlated material with nontrivial topology
- Valence and magnetic ordering in intermediate valence compounds : TmSe versus SmB6
- Pressure-resistant intermediate valence in Kondo insulator SmB6
- Scanning tunneling spectroscopy and surface quasiparticle interference in models for the strongly correlated topological insulators SmB6 and PuB6
- A highly asymmetric nodal semimetal in bulk SmB6
- The anomalous antiferromagnetic topological phase in pressurized SmB6
- Topological piezoelectric effect and parity anomaly in nodal line semimetals
- Novel Kondo-like behavior near magnetic instability in SmB : temperature and pressure dependences of Sm valence
- A RIXS investigation of the crystal-field splitting of Sm in SmB
- Spin-selective tunneling from nanowires of the candidate topological Kondo insulator SmB6
- Topology and Magnetism in the Kondo Insulator Phase Diagram
- Topological properties of magnetically ordered heavy-fermion systems in the presence of mirror symmetry