Séminaire de Physique ThéoriqueTopological excitations in multi-component superconductors: Domain-walls, Skyrmions and Vortices
Friday 28 February 2014 14:00 - Tours - Salle 1180 (Bât E2)
I will address various aspects of the topological excitations that arise in models of superconductivity when multiple charged condensates are involved. Recently discovered iron-based superconductors can exhibit a spontaneous breaking of the time reversal symmetry. Since it is a discrete symmetry, its spontaneous breaking is associated with proliferation of domain walls. Despite their topological protection, domain walls are dynamically unstable in homogeneous finite systems. I will show that they can nevertheless be stabilized using geometric barriers. I will also illustrate how Kibble-Zurek mechanism can be assisted in order to experimentally control their creation. Finally, I will address their observable properties together with those of other excitations like vortices and skyrmions.