Phase-modulated superconductivity via altermagnetism

Abstract

Stimulated by recent interest in altermagnets, a novel class of antiferromagnets with macroscopic time-reversal symmetry breaking, we investigate the coexistence of altermagnetism and superconductivity. By developing a Ginzburg--Landau theory based on microscopic models, we show that a phase-modulated Fulde--Ferrell superconducting state is stabilized via altermagnetic spin splitting, in contrast to the typical amplitude-modulated states that occur under the uniform Zeeman field. We apply our framework to different models to compare the resulting phase diagrams: a two-sublattice model with altermagnetic order, a continuum model with an anisotropic Zeeman field mimicking altermagnetic spin splitting, and a conventional square-lattice model with two kinds of anisotropic Zeeman fields. We show that the multisublattice structure is crucial for realizing the phase-modulated superconductivity, and highlight spin-split altermagnets as a promising platform for exploring this exotic superconductivity without external magnetic fields.

18 pages, 1 table and 8 figures; published version

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Cited by in corpus (8)

• Unconventional superconductivity of an altermagnetic metal: Polarized BCS and inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states
• Electric and spin current vortices in altermagnets
• Quantum Lifshitz points in an altermagnetic metal
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Inherent momentum-dependent gap structure of altermagnetic superconductors
• Altermagnetism-driven FFLO superconductivity in finite-filling 2D lattices
• Superconducting States and Intertwined Orders in Metallic Altermagnets
• Spin triplet pairing by suppressing altermagnetism