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TT: Fachverband Tiefe Temperaturen
TT 10: Topology: Majorana Physics I
TT 10.9: Talk
Monday, March 18, 2024, 17:15–17:30, H 2053
Manipulation of Majorana bound states − Stability, Topological fragmentation, and Braiding — •Balázs Ujfalussy1, András Lászlóffy1, Gábor Csire2, Nóra Kucska1, Bendegúz Nyári3, and László Szunyogh3 — 1HUN-REN Wigner Research Centre for Physics, Budapest, Hungary — 2Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria — 3Budapest University of Technology and Economics, Budapest, Hungary
In this talk, we provide a detailed and quantitative theoretical description of the effects of manipulating spins in an iron chain deposited on top of Au/Nb heterostructure in the superconducting state and hosting a Majorana Zero Mode by applying a first-principles computational approach. By studying the superconducting order parameter and the quasiparticle charge density of states (CDOS), we perform computational experiments in spin spiral chains that shed light on several concerns and difficulties during practical applications and add new aspects to the interpretation of recent experiments. We explore the stability of topological zero energy states, the formation of and distinction between topologically trivial and non-trivial zero energy edge states, the emergence of topological fragmentation, and the shift of Majorana Zero Modes along the superconducting nanowires These findings open avenues toward the implementation of a braiding operation.
Keywords: superconductor; band inversion; magnetic chain; magnetic spiral state; spin-orbit coupling