Group seminar Theoretical Physics III

23.10.2019 10:45 a.m., room: S-439
Dr. Sanjeev Kumar (Indian Institute of Science Education and Research Mohali, India)
Topological transitions in a model for proximity-induced superconductivity

Using a prototype model for proximity induced superconductivity on a bi-layer square lattice, we show that inter-layer tunneling can drive change in topology of the Bogoliubov quasiparticle bands. Starting with topologically trivial superconductors, transitions to a non-trivial $p_x + i p_y$ state and back to another trivial state are discovered. We characterize these phases in terms of their edge-state spectra and Chern indices. We show that these transitions can also be controlled by the bandwidth of the metallic layer or by a transverse electric field. The calculations are performed within BCS mean-field framework. However, we use an unrestricted approach in defining the symmetry of the superconducting order parameters. This allows for existence of unconventional order parameters within the broken-symmetry mean-field approximation.

11.12.2019 10:45 a.m., room: S-439
Dr. Markus Eisenbach (Oak Ridge National Laboratory, USA)
Large scale first principles materials calculations using multiple scattering theory
22.1.2020 10:45 a.m., room: S-439
Prof. Dr. Dieter Vollhardt (Universität Augsburg)
The art of modeling in solid state physics & the current state of DMFT
5.2.2020 10:45 a.m., room: S-439
Dr. Saikat Banerjee
Interacting Dirac materials