Séminaire de Physique ThéoriqueGround states of multi-component type-II and type-1.5 superconductors
Julien Garaud (University of Massachusetts Amherst and KTH Stockholm)
Thursday 29 September 2011 11:00 - Tours - Salle 1180 (Bât E2)
I report numerical study of magnetic field-induced structures in multiband/multi-component superconductors and multi-layered superconductors. The magnetic ground state in these different regimes shows very rich structure formation in the so-called semi-Meissner state. I will also discuss properties of three-band Ginzburg-Landau models which do not have direct counterparts in more studied two-band models. In particular, time reversal symmetry broken vacua exhibit very new magnetic flux-carrying stable topological solitons which have only a slightly higher energy than ordinary vortices. I will also discuss semi-Meissner state where the system has a macroscopic phase separation in domains with broken $U(1)$ and $U(1)\times Z_2$ symmetries.