Altermagnetism from coincident Van Hove singularities: application to $\kappa$-Cl

Abstract

Realizing two-dimensional (2D) altermagnets is important for spintronics applications. Here we propose a microscopic template for stabilizing 2D altermagnetism through Van Hove singularities that are coincident in both energy and momentum. These coincident Van Hove singularities are a generic consequence of non-symmorphic symmetries in nine 2D space groups. Due to nontrivial symmetry properties of the Hamiltonian, these coincident Van Hove singularities allow new hopping interactions between the Van Hove singularities that do not appear in analogous Van Hove singularity based patch models for cuprates and graphene. We show these new interactions can give rise to various weak coupling, and BCS-based instabilities, including altermagnetism, nematicity, inter-band d-wave superconductivity, and orbital altermagnetic order. We apply our results to quasi-2D organic $\kappa$-Cl in which altermagnetism is known to appear.

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Cited by in corpus (6)

• Phase-modulated superconductivity via altermagnetism
• Spin and pair density waves in 2D altermagnetic metals
• Fractionalized Altermagnets: from neighboring and altermagnetic spin-liquids to spin-symmetric band splitting
• Van-Hove singularities and competing instabilities in an altermagnetic metal
• Electric field controlled second-order anomalous Hall effect in altermagnets
• Spontaneous emergence of altermagnetism in the single-orbital extended Hubbard model