## Topological magnon bands and effective Hamiltonians for periodically driven systems

**Speaker:**Greg Fiete, Northeastern University

**When:**September 26, 2018 (Wed), 03:00PM to 04:00PM (add to my calendar)

**Location:**SCI 328

**Hosted by:**Anushya Chandran

*This event is part of the Condensed Matter Theory Seminar Series. *

The effect of spin-orbit coupling in condensed matter systems has received intense study over the past decade, most notably in the context of topological band insulators where electron-electron interactions are not essential for the topological properties. In this talk, I will focus on the opposite limit of strong electronic correlations with spin-orbit coupling. I will describe two different (materials motivated) two-dimensional models in which the spin-orbit coupling leads to topological band structure in the magnetic excitations. In the second part of the talk, I will turn to recent work describing an approach to achieving effective time-independent Hamiltonians for periodically driven, interacting many-particle systems. The method agrees with the Magnus expansion in the high frequency limit, but appears to also work well in the strong-driving, low-frequency limit.