Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 98: Poster Session: Superconductivity

TT 98.22: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Delocalized Shiba bands in magnetic clusters at superconducting surfaces — •Simon Körber, Oleksiy Kashuba, and Björn Trauzettel — Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany

If a number of magnetic atoms is placed sufficiently close to each other on the surface of a superconductor, their Shiba states hybridize and form a band structure inside the superconducting gap. We show that for particular cases a degenerate delocalized flat band emerges in the energy spectrum. We solve the problem analytically for arbitrary spin configuration and analyze both trivial and non-trivial solutions. The wave functions of the trivial solutions effectively decouple from the total magnetic moment of the cluster. This is the reason why they form flat bands. The energies of the dispersing bands corresponding by two non-trivial solutions can be characterized solely by the net magnetic moment of the cluster.