Spin chains on superconducting surfaces

Resumen del trabajo presentado a la International Conference on Nanoscience + Technology (ICN+T), celebrada en Brno (Czech Republic) del 22 al 27 de julio de 2018.A magnetic impurity on a superconductor can create a bound state. The state is localized to the magnetic impurity but it extends well into the superconductor and along the surface. Spin chains can be formed by adding impurities, as a consequence the number Shiba state increases forming Shiba bands. Under certain conditions, some of these bands can cross the Fermi energy, closing the superconducting gap. This can give rise to change in the topological electronic structure of the system. As a consequence, if the chain is not infinite, bound states at the edges of the chain are actually Majorana fermions. I will show model calculations analyzing the case of Cr chains on a β-Bi2Pd superconductor.Peer reviewe