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SPECIAL CONDENSED MATTER SEMINAR<br>Measurements of Superconductivity Instabilities in Multi-orbital Systems with Spin-orbit Coupling</br>

Wednesday, April 16, 2014
12:00 AM
2246 Randall

In this talk, I will first present a new scheme to measure and construct the non-local, two-particle vertex functions beyond the dynamic mean field theory (DMFT) simulations, in which one first measures the local vertex functions in DMFT, then through the help of two-particle diagrammatic techniques – Bethe-Salpeter equation and parquet equations – introduces the momentum-dependence into the two-particle vertex and correlation functions. Then, I will present the application of such scheme to the measurement of superconductivity instabilities in several strongly correlated systems: in one-band Hubbard model on square lattice, a d-wave singlet pairing instability can be seen; in the t2g multi-orbital correlated system with strong spin-orbit coupling, a two-fold degenerate, p-wave triplet pairing instability is observed when Hund's coupling is comparable with spin-orbit coupling, and a d-wave singlet pairing state is found in when Hund's coupling is small.