University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Thursday, October 11th 2018
3:35 pm:
Speaker: Joel Moore, UC Berkeley
Subject: Topology and the electromagnetic responses of quantum materials
Refreshments in atrium after the Colloquium.

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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