Séminaire de Physique Théorique

Topological excitations in multi-component superconductors: Domain-walls, Skyrmions and Vortices
Julien Garaud
Friday 28 February 2014 14:00 -  Tours -  Salle 1180 (Bât E2)

Résumé :
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.

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