Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 15: Topology: Majorana Physics
TT 15.13: Talk
Monday, March 9, 2026, 18:15–18:30, HSZ/0105
Ab initio band structure of magnetic chains on superconductors — •Bendegúz Nyári1,3, András Lászlóffy2, Balázs Újfalussy2, László Szunyogh3, and Levente Rózsa2,3 — 1HUN-REN-BME Condensed Matter Research Group — 2HUN-REN Wigner Research Centre for Physics — 3Budapest University of Technolofy and Economics
The detection of band topology and the reliability of Majorana Zero Mode (MZM) observations based only on real space quantities is a long standing problem. Due to the bulk edge correspondence the appearance of MZMs in a finite chain is related to the properties of the band structure, or more precisely the topological invariant, however these quantities can not be measured directly.
In this work I present an ab initio approach which provides direct access to the band structure of magnetic chains on superconductors. The method relies on a 1D embedding scheme and includes the effect of the infinite host to the chain.
The method was applied to Mn chains on Nb(110) and Ta(110) where the topological properties and symmetry aspects of the band structure were studied together showing the coexistence of trivial and non-trivial bands in the band structure [1].
[1] B. Nyári et al., Phys. Rev. B 112 (2025) 115414
Keywords: Shiba bands; band structure; magnetic chains; topology; Majorana