En las fronteras de la Materia Condensada

The vortex system is a model system of interacting elastic objects in disordered media. Recently it was found that it can be trapped in different robust dynamical states characterized by the degree of mobility, depending on the local thermo-magnetic history of the sample. When vortices are "shaken" by a temporarily symmetric ac field they are driven into an easy-to-move structure but, on the contrary, when the ac field is temporarily asymmetric, they are driven into a more pinned state. The effective pinning potential wells that control the vortex motion inside the pinning sites can also be tuned by the "shaking" procedure, and deeper wells correlate with less mobile dynamical states.