Affiliation
University of the Basque Country
Title
Anomalous currents, magnetic response and magnetic interactions in 2D gyrotropic superconductors
Abstract
In this talk I will discuss the interplay of superconductivity and magnetism in quantum 2D materials with broken out-of-plane reflection. The most known examples are Rashba systems and surfaces of topological insulators, but this type of gyrotropic symmetry is realized in any 2D layer deposited on a substrate that makes its top and bottom sides different. In the presence of spin-orbit coupling and the spin-splitting Zeeman field, superconductors with such symmetry support spontaneous, so called anomalous, supercurrents and/or generation of phase gradients across the system. The presence of anomalous currents dramatically modifies the spin response of 2D superconductors, leading to highly nontrivial finite size corrections to the paramagnetic response, and unusual long range interaction between magnetic impurities which, for some types of lattices may favor a superconductivity induced ferromagnetic ordering.