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math-ph2025
Multifold degeneracy points of quantum systems and singularities of matrix varieties
György Frank, András Pályi, Gergő Pintér +1
Parameter-dependent quantum systems often exhibit energy degeneracy points, whose comprehensive description naturally lead to the application of methods from singularity theory. A…
math-ph2023
Singularity theory of Weyl-point creation and annihilation
György Frank, Gergő Pintér, András Pályi
Weyl points (WP) are robust spectral degeneracies, which can not be split by small perturbations, as they are protected by their non-zero topological charge. For larger perturbatio…