Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.
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In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.
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Extended s-wave altermagnets
Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.
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Superconductivity near two-dimensional Van Hove singularities: a determinant quantum Monte Carlo study
In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.