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Past Events
Measurements of Superconductivity Instabilities in Multi-orbital Systems with Spin-orbit Coupling
| Speaker: | Dr. Zi Yang MENG |
| Affiliation: | Institute of Physics, Chinese Academy of Sciences; Department of Physics, University of Toronto |
| Date: | August 11, 2014 (Mon) |
| Time: | 4:00 p.m. |
| Venue: | Room 522, 5/F, Chong Yuet Ming Physics Building, HKU |
Abstract
In this talk, I will first present a new numerical scheme to calculate 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 introduces the momentum-dependence into the two-particle vertex and correlation functions with the help of two-particle diagrammatic techniques - Bethe-Salpeter equation and parquet equations. I will then present the application of such scheme to the measurement of superconductivity instabilities in several strongly correlated systems: in Hubbard model on square lattice with type-II van Hove singularity, a topological p+ip triplet pairing instability can be seen; in the t2g multi-orbital correlated system with strong spin-orbit coupling, a two-fold degenerate, topological, 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.
Coffee and tea will be served 20 minutes prior to the seminar.