Research | Collaborazioni Scientifiche | Seminari e Convegni
Dr. Mattia Trama (Institute for Theoretical Solid State Physics, IFW Dresden, Germany)
Surface superconductivity on time-reversal symmetric Weyl systems: a self-consistent approach
Dr. Mattia Trama (Institute for Theoretical Solid State Physics, IFW Dresden, Germany)
Aula S3 (Edificio F)
The recent discovery of the superconducting surface on the time-reversal symmetric Weyl semimetal PtBi2 has raised the question of the origin of such a phenomenon.
Indeed, such a compound exhibits a critical temperature difference between the surface and the bulk of about an order of magnitude.
In this talk we propose an explanation for the emergence of the superconducting Fermi arcs invoking standard local s-wave singlet pairing as the superconducting coupling. We test our superconducting model applying it to a time-reversal symmetric Weyl tight-binding system for with a finite size.
Our self-consistent calculation predicts a different critical temperature for the surface and the bulk, leading to the possibility of superconductivity in only few layers of the material. We also predict a temperature dependence on the penetration of surface superconductivity, suggesting a competition between two order parameters.
