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Thursday, October 11th 2018

3:35 pm:

This talk starts by reviewing the remarkable theoretical and experimental

progress in topological materials over the past decade. Three-dimensional

topological insulators realize a particular electromagnetic coupling known as

“axion electrodynamics”, and understanding this leads to an improved

understanding of magnetoelectricity in all materials. We then turn to how

topological Weyl and Dirac semimetals can show unique electromagnetic

responses; we argue that in linear response the main observable effect

solves an old problem via the orbital moment of Bloch electrons, and how

in nonlinear optics there should be a new quantized effect, at least approximately.

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