Marginal Metals and Kosterlitz-Thouless Type Phase Transition in Disordered Altermagnets
arXiv:2507.10762 · doi:10.1103/ssb5-vm9b
Abstract
Altermagnetism, a recently discovered magnetic phase characterized by spin-split bands without net magnetization, has emerged as promising platform for novel physics and potential applications. However, its stability against disorder-ubiquitous in real materials-remains poorly understood. Here, we study the electron localization properties of two-dimensional -wave altermagnets subject to disorder. Remarkably, we discover a disorder-driven phase transition from a marginal metallic phase to an insulator, which falls into the Kosterlitz-Thouless class. We demonstrate this by strong numerical evidence and propose an interpretation in terms of vortex-antivortex pairs in the disorder-induced local in-plane spin magnetization. Moreover, we show that the characteristic spin anisotropy of altermagnets persists but gradually fades away across the transition. These changes directly affect the spin splitting features that are detectable in angle-resolved photoemission spectroscopy and tunneling magnetoconductance. Our findings provide a new perspective on recent experimental observations of altermagnetism in candidate materials.
7+6 pages, 5+7 figures, to appear in PRL
References in corpus (59)
- Classification of topological insulators and superconductors in three spatial dimensions
- Localization of interacting fermions at high temperature
- Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
- The distribution of the ratio of consecutive level spacings in random matrix ensembles
- Crystal Hall effect in Collinear Antiferromagnets
- Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets
- Efficient Electrical Spin-Splitter Based on Non-Relativistic Collinear Antiferromagnetism
- Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering
- Multifunctional Antiferromagnetic Materials with Giant Piezomagnetism and Noncollinear Spin Current
- Broken Kramers' degeneracy in altermagnetic MnTe
- Giant and tunneling magnetoresistance effects from anisotropic and valley-dependent spin-momentum interactions in antiferromagnets
- Spin current generation in organic antiferromagnets
- Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
- Direct observation of altermagnetic band splitting in CrSb thin films
- Antiferromagnetism in RuO as -wave Pomeranchuk instability
- Crystal Thermal Transport in Altermagnetic RuO2
- Mobility Edges in 1D Bichromatic Incommensurate Potentials
- Spin-group symmetry in magnetic materials with negligible spin-orbit coupling
- Large band-splitting in -wave type altermagnet CrSb
- Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
- dc Josephson Effect in Altermagnets
- Topological Superconductivity in Two-Dimensional Altermagnetic Metals
- Finite-momentum Cooper pairing in proximitized altermagnets
- Localization and Kosterlitz-Thouless Transition in Disordered Graphene
- Antiferroelectric Altermagnets: Antiferroelectricity Alters Magnets
- Ferroelectric switchable altermagnetism
- Three-dimensional mapping of the altermagnetic spin splitting in CrSb
- Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism
- Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
- Absence of altermagnetic spin splitting character in rutile oxide RuO
- Andreev reflection at the altermagnet-superconductor interface
- Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
- Chiral-Split Magnon in Altermagnetic MnTe
- Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
- Anderson localization and the quantum phase diagram of three dimensional disordered Dirac semimetals
- Phase-shifted Andreev levels in an altermagnet Josephson junction
- Majorana corner modes and tunable patterns in an altermagnet heterostructure
- Fragility of the magnetic order in the prototypical altermagnet RuO
- Mirror Chern Bands and Weyl Nodal Loops in Altermagnets
- Observation of Spin Splitting in Room-Temperature Metallic Antiferromagnet CrSb
- Spontaneous Formation of Altermagnetism from Orbital Ordering
- Reconciling Conductance Fluctuations and the Scaling Theory of Localization
- Altermagnetic anomalous Hall effect emerging from electronic correlations
- Realizing Altermagnetism in Fermi-Hubbard Models with Ultracold Atoms
- Two-Dimensional Ferroelectric Altermagnets: From Model to Material Realization
- Third-order and fifth-order nonlinear spin-current generation in -wave and -wave altermagnets, and perfectly nonreciprocal spin-current in -wave magnets
- Coulomb Drag in Altermagnets
- Criticality of the metal-topological insulator transition driven by disorder
- Effects of random domains on the zero Hall plateau in quantum anomalous Hall effect
- Tunable second harmornic in altermagnetic Josephson junctions
- Impurity-induced Friedel oscillations in altermagnets and -wave magnets
- Design of altermagnetic models from spin clusters
- Nonlinear Superconducting Magnetoelectric Effect
- Fragile Unconventional Magnetism in RuO by Proximity to Landau-Pomeranchuk Instability
- d-wave to s-wave to normal metal transitions in disordered superconductors
- Local signatures of altermagnetism
- Impurity states in altermagnetic superconductors
- Anderson Critical Metal Phase in Trivial States Protected by Average Magnetic Crystalline Symmetry
- Quasiparticle interference in altermagnets