23.10.2019  10:45 a.m., room: S439 
Dr. Sanjeev Kumar
(Indian Institute of Science Education and Research Mohali, India)
Topological transitions in a model for proximityinduced superconductivity Using a prototype model for proximity induced superconductivity on a bilayer square lattice, we show that interlayer tunneling can drive change in topology of the Bogoliubov quasiparticle bands. Starting with topologically trivial superconductors, transitions to a nontrivial $p_x + i p_y$ state and back to another trivial state are discovered. We characterize these phases in terms of their edgestate 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 meanfield 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 brokensymmetry meanfield approximation. 

11.12.2019  10:45 a.m., room: S439 
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: S439 
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: S439 
Dr. Saikat Banerjee
Interacting Dirac materials 