2025/04/11 by Ioannis Ioannidis, Ioannidis, Ioannis, Ching-Kai Chiu +5 · 1 voice
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Block (permutation group theory) #Brillouin zone #Class (philosophy) #High-pressure geophysics and materials #Lattice (music) #MAJORANA #Organic and Molecular Conductors Research #Physics of Superconductivity and Magnetism #Quantum #Rare-earth and actinide compounds #Sequence (biology) #Singlet state #Superconductivity #Symmetry (geometry) #Topological Materials and Phenomena #Topology (electrical circuits)
paper · pdf · open access · doi:10.1103/xmzx-p2x9
published in Physical review. B./Physical review. B 114(6) (American Physical Society)
openalex publication_date 2026/06/23 · openalex created_date 2026/06/24 · openalex updated_date 2026/07/25
Recent experiments engineered special spin-degenerate Andreev bound states in atomic cages of adatoms on superconductors, the Machida-Shibata states, a promising building block for quantum matter. Here, we investigate the formation of time-reversal symmetric bands by hybridizing multiple such states and analyzing their electronic topological properties assuming small on-site electron repulsion. The low-energy theory shows that competing emerging singlet and triplet superconducting pairings drive the formation of topologically nontrivial phases in symmetry class DIII. Therefore, we predict that Kramers pairs of Majorana zero modes will appear at the ends of Machida-Shibata chains, while two-dimensional lattices will host helical Majorana edge modes. Additionally, we discover extended regions in the Brillouin zone with vanishing superconducting pairings, which are lifted by the repulsive electron interactions. Our findings offer new perspectives for manipulating topological superconductivity and pairings in nonmagnetic adatom systems.