Magnetic moments in superconductors: From Yu-Shiba-Rusinov states, to topological superconductors and frustrated magnetism

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• Prof. Jens Paaske, University of Copenhagen
• Thursday 08 June 2017, 14:15-15:15
• TCM Seminar Room, Cavendish Laboratory.

If you have a question about this talk, please contact Gareth Conduit.

Motivated by recent STM experiments, we study lattices of magnetic adatoms exchange coupled to the surface of a conventional s-wave superconductor. In this talk, I demonstrate how a variety of collective magnetic and electronic phases emerge in this system, due to the interplay between ferromagnetism and superconductivity. In particular, an adatom chain on a bulk (2D or 3D) superconductor can order into a magnetic spiral state leading to, and stabilized by, the opening of a topological superconducting gap within the band of Yu-Shiba-Rusinov (YSR) sub-gap states induced by the magnetic moments. In two dimensions, a square lattice of magnetic moments is shown to exhibit strong magnetic frustration due to the long-ranged indirect exchange coupling mediated by the hybridization of YSR states. Finally, I shall touch upon recent experiments on transport through artificial magnetic adatoms realized in single, and double quantum dots, – a perfect lab for studying the physics of individual YSR states.

This talk is part of the Theory of Condensed Matter series.

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