Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 69: Nanostructures at surfaces:1D, 2D, networks – Poster
O 69.3: Poster
Wednesday, March 11, 2026, 18:00–20:00, P2
Superconducting quantum corrals — •Divya Jyoti1 and Nicolás Lorente2 — 1Christian-Albrechts-Universität zu Kiel, Kiel, Germany — 2Centro de Fisica de Materiales (CFM), Donostia - San Sebastian, Spain
Quantum corrals enable atomically precise control of electronic confinement on surfaces, and their extension to superconductors opens new possibilities for manipulating in-gap Bogoliubov quasiparticles. In this work, we develop a microscopic Bogoliubov-de-Gennes Green-function framework [1-2] for multiple δ-like impurities on 2D superconducting lattices. As a benchmark, the method reproduces the superconducting mirage associated with Yu-Shiba-Rusinov states in elliptical corrals. By tuning the corral geometry, and material parameters, the spatial structure and spectral evolution of in-gap quasiparticle states is determined. We further explore the effect of confinement on engineered topological phases by placing a Majorana-hosting ferromagnetic spin chain inside an elliptical corral and showing that geometric confinement strongly hybridizes its zero-energy modes, redistributing their spin texture and shifting spectral weight to finite energies. These confined in-gap states offer a new route to engineer topological features, linking atomically crafted quantum matter to emerging platforms for topological quantum computation. [1] Morr et al., Phys. Rev. Lett. 92, 107006 (2004) [2] Flatté et al., Phys. Rev. B 56, 11213 (1997)
Keywords: Magnetic impurities; Superconductors; Spin chains; Topological superconductivity; Elliptical corrals