Research paperTheoreticalStability of Weyl node merging processes under symmetry constraintsGabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga et al.arXiv·2024·10.1038/s42005-·arXiv:2403.08518AbstractWe study how C₂T symmetry constrains Weyl-node merging processes in Weyl semimetals. Using contact equivalence and codimension arguments for generic traceless 2×2 Hamiltonians, we show that three-node merging processes are stable while two-node processes are fine-tuned and unstable. We also analyze perturbed double-Weyl-node normal forms and illustrate the results with simplified tight-binding models relevant to SrSi₂ and bilayer graphene.Read more
Research paperTheoreticalStability of Weyl node merging processes under symmetry constraintsGabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga et al.arXiv·2024·10.1038/s42005-·arXiv:2403.08518AbstractWe study how C₂T symmetry constrains Weyl-node merging processes in Weyl semimetals. Using contact equivalence and codimension arguments for generic traceless 2×2 Hamiltonians, we show that three-node merging processes are stable while two-node processes are fine-tuned and unstable. We also analyze perturbed double-Weyl-node normal forms and illustrate the results with simplified tight-binding models relevant to SrSi₂ and bilayer graphene.Read more
Research paperTheoreticalStability of Weyl node merging processes under symmetry constraintsGabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga et al.arXiv·2024·10.1038/s42005-·arXiv:2403.08518AbstractWe study how C₂T symmetry constrains Weyl-node merging processes in Weyl semimetals. Using contact equivalence and codimension arguments for generic traceless 2×2 Hamiltonians, we show that three-node merging processes are stable while two-node processes are fine-tuned and unstable. We also analyze perturbed double-Weyl-node normal forms and illustrate the results with simplified tight-binding models relevant to SrSi₂ and bilayer graphene.Read more
Research paperTheoreticalStability of Weyl node merging processes under symmetry constraintsGabriele Naselli, György Frank, Dániel Varjas, Ion Cosma Fulga et al.arXiv·2024·10.1038/s42005-·arXiv:2403.08518AbstractWe study how C₂T symmetry constrains Weyl-node merging processes in Weyl semimetals. Using contact equivalence and codimension arguments for generic traceless 2×2 Hamiltonians, we show that three-node merging processes are stable while two-node processes are fine-tuned and unstable. We also analyze perturbed double-Weyl-node normal forms and illustrate the results with simplified tight-binding models relevant to SrSi₂ and bilayer graphene.Read more
