Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 28: Topology: Other Topics
TT 28.3: Talk
Tuesday, March 19, 2024, 10:00–10:15, H 3025
Signatures of topologically non-trivial band structures based on real-space simulations — •Bendegúz Nyári1,2, Lászlóffy András3, Levente Rózsa3, László Szunyogh1,2, and Balázs Újfalussy3 — 1Department of Theoretical Physics, Budapest University of Technology and Economics, Budapest, Hungary — 2HUN-REN-BME Condensed Matter Research Group, Budapest University of Technology and Economics, Budapest, Hungary — 3HUN-REN Wigner Research Centre for Physics, Budapest Hungary
The topological properties of magnetic chains placed on superconductors can be derived from momentum-space quantities related to an infinite chain. The topologically non-trivial band structure gives rise to Majorana end states at zero energy in finite chains.
However, without a translational symmetric system in hand, it is also possible to identify the signatures of the band topology in real-space calculations of finite chains based on the superconducting order parameter and the quasiparticle density of states. Also the spectrum of the chain can be approximated based on the quasiparticle spectrum obtained from the Fourier transformed density of states.
In this talk, I apply this theory to Fe chains on Au/Nb(110) [1] and Mn chains on Nb(110) and study the topology of the band structure.
[1] B.Nyari et al., Phys. Rev. B 108 (2023) 134512
Keywords: band inversion; first principles; Majorana states