Mads Barkman

KTH, Royal Institute of Technology, Sweden

Enhancement of superconductivity near boundaries

The behaviour of superconductivity near boundaries and interfaces is both of fundamental importance, and extremely relevant to the mesoscopic physics of superconducting devices. In this talk, I will present our work which demonstrates that superconductor-vacuum interfaces may support enhanced boundary superconductivity with a separate elevated critical temperature. The enhancement is present in ordinary s-wave superconductors, as well as in unconventional superconductors such as pair-density-wave and multiband superconductors. This series of work shows that the well-established Caroli-de Gennes-Matricon theory of boundary superconductivity needs to be revised.