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SUMMARY:Magnetic moments in superconductors: From Yu-Shiba-Rusinov states\
 , to topological superconductors and frustrated magnetism - Prof. Jens Paa
 ske\, University of Copenhagen
DTSTART:20170608T131500Z
DTEND:20170608T141500Z
UID:TALK71990@talks.cam.ac.uk
CONTACT:Gareth Conduit
DESCRIPTION:Motivated by recent STM experiments\, we study lattices of mag
 netic adatoms exchange coupled to the surface of a conventional s-wave sup
 erconductor. In this talk\, I demonstrate how a variety of collective magn
 etic and electronic phases emerge in this system\, due to the interplay be
 tween ferromagnetism and superconductivity. In particular\, an adatom chai
 n on a bulk (2D or 3D) superconductor can order into a magnetic spiral sta
 te leading to\, and stabilized by\, the opening of a topological supercond
 ucting gap within the band of Yu-Shiba-Rusinov (YSR) sub-gap states induce
 d by the magnetic moments. In two dimensions\, a square lattice of magneti
 c moments is shown to exhibit strong magnetic frustration due to the long-
 ranged indirect exchange coupling mediated by the hybridization of YSR sta
 tes. 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.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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