Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 15: Topology: Majorana Physics
TT 15.12: Vortrag
Montag, 9. März 2026, 18:00–18:15, HSZ/0105
Ab Initio Exploration of Material Platforms for Majorana Zero Modes in Magnetic Chains on Superconductors — •András Lászlóffy1,2, Bendegúz Nyári3, Levente Rózsa2, László Szunyogh3, and Balázs Újfalussy2 — 1Pázmány Péter Catholic University, Budapest, Hungary — 2HUN-REN Wigner Research Centre for Physics, Budapest, Hungary — 3Budapest University of Technology and Economics, Budapest, Hungary
In magnetic chains on superconductors, Shiba bands are formed within the superconducting gap. Spin-orbit coupling or a spin-spiral configuration can lead to the hybridization of Shiba bands which can open a topologically non-trivial gap around the Fermi energy. To have a quantitative and realistic description of these systems, we solve the Kohn-Sham-Dirac Bogoliubov-de Gennes equations within the Korringa-Kohn-Rostoker multiple scattering theory. Elementary superconducting surfaces rarely support the appearance of a topological superconducting state, since either the superconducting gap or the spin-orbit coupling strength is small.[1] By adding a non-magnetic overlayer between the superconductor and the chain, we explore the topological properties of a large variety of systems in terms of varying the type of magnetic atoms in the chain and its crystallographic direction. We demonstrate that the formation of a spin spiral state has a larger impact on the robustness of the topologically non-trivial band structure than the enhanced spin-orbit coupling.
[1] Nyári et. al., PRB 112 (2025) 115414
Keywords: Superconductivity; Magnetic chain; Majorana fermions; Spin-orbit coupling; Noncollinear magnetism