Real Chern insulators in two-dimensional altermagnetic FeSO and FeSeO
arXiv:2511.03602 · doi:10.1103/kplp-819f
Abstract
Altermagnets, recently identified as a third class of collinear magnetic materials, have attracted significant attention in condensed matter physics. Despite this growing interest, the realization of real Chern insulators in intrinsic altermagnetic systems has rarely been reported. In this work, based on first-principles calculations and theoretical analysis, we identify monolayer FeSO and FeSeO as a novel class of two-dimensional altermagnetic real Chern insulators. We demonstrate that these materials possess altermagnetic ground states and host a nontrivial mirror real Chern number, leading to the emergence of symmetry-protected zero-dimensional corner states. Notably, these corner modes are spin-polarized, giving rise to a unique spin-corner coupling effect. We further show that the real Chern insulating phases and their associated corner states remain robust against spin-orbit coupling, as well as under both uniaxial and biaxial strain. Additionally, these materials exhibit pronounced linear dichroism and strong optical absorption. Our findings uncover the novel topological character of FeSO and FeSeO, establishing them as promising platforms for exploring real Chern insulators in altermagnetic systems.
9 pages, 7 figures
References in corpus (60)
- Topological Insulators
- Topological insulators and superconductors
- Weyl and Dirac Semimetals in Three Dimensional Solids
- Wannier90 as a community code: new features and applications
- Colloquium: Topological Band Theory
- Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
- Crystal Hall effect in Collinear Antiferromagnets
- Observation of the Anomalous Hall Effect in a Collinear Antiferromagnet
- Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets
- Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
- Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
- Giant and tunneling magnetoresistance effects from anisotropic and valley-dependent spin-momentum interactions in antiferromagnets
- Spin current generation in organic antiferromagnets
- Tilted spin current generated by the collinear antiferromagnet RuO2
- Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
- Spontaneous anomalous Hall effect arising from an unconventional compensated magnetic phase in a semiconductor
- Failure of Nielsen-Ninomiya theorem and fragile topology in two-dimensional systems with space-time inversion symmetry: application to twisted bilayer graphene at magic angle
- Prediction of unconventional magnetism in doped FeSb2
- Antiferromagnetism in RuO as -wave Pomeranchuk instability
- Bottom-up design of spin-split and reshaped electronic band structures in spin-orbit-coupling free antiferromagnets: Procedure on the basis of augmented multipoles
- Two-dimensional second-order topological insulator in graphdiyne
- Itinerant Antiferromagnetism in RuO
- Higher-Order Topological Insulator in Twisted Bilayer Graphene
- Band Topology and Linking Structure of Nodal Line Semimetals with Z2 Monopole Charges
- Observation of plaid-like spin splitting in a noncoplanar antiferromagnet
- Spin-group symmetry in magnetic materials with negligible spin-orbit coupling
- Large band-splitting in -wave type altermagnet CrSb
- Fermi liquid instabilities in the spin channel
- Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
- Valley-dependent properties of monolayer MoSiN, WSiN and MoSiAs
- Anomalous Antiferromagnetism in Metallic RuO Determined by Resonant X-ray Scattering
- Topological Superconductivity in Two-Dimensional Altermagnetic Metals
- Finite-momentum Cooper pairing in proximitized altermagnets
- Antiferroelectric Altermagnets: Antiferroelectricity Alters Magnets
- Enumeration and representation theory of spin space groups
- Ferroelectric switchable altermagnetism
- Two-dimensional higher-order topology in monolayer graphdiyne
- Unified theory of PT and CP invariant topological metals and nodal superconductors
- Three-dimensional mapping of the altermagnetic spin splitting in CrSb
- Liganded Xene as a Prototype of Two-Dimensional Stiefel-Whitney Insulators
- Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
- Andreev reflection at the altermagnet-superconductor interface
- Symmetric Real Dirac Fermions and Semimetals
- Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
- Geometric approach to fragile topology beyond symmetry indicators
- Spin Space Groups: Full Classification and Applications
- Enumeration of spin-space groups: Towards a complete description of symmetries of magnetic orders
- Majorana corner modes and tunable patterns in an altermagnet heterostructure
- Second-Order Real Nodal-Line Semimetal in Three-Dimensional Graphdiyne
- Stiefel-Whitney classes and topological phases in band theory
- Creation and Manipulation of Higher-Order Topological States by Altermagnets
- Second Order Topological Insulator State in Hexagonal Lattices and its Abundant Material Candidates
- Topological Weyl Altermagnetism in CrSb
- Quadrupole topological insulators in Ta2M3Te5 (M= Ni, Pd) monolayers
- Structures and Physical Properties of CsVSeO and VSeO
- Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb
- Unconventional p-wave and finite-momentum superconductivity induced by altermagnetism through the formation of Bogoliubov Fermi surface
- Cornertronics in Two-Dimensional Second-Order Topological Insulators
- G-type Antiferromagnetic BiFeO is a Multiferroic -wave Altermagnet
- Pair Density Waves and Supercurrent Diode Effect in Altermagnets