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Chiral anomaly, topological field theory, and novel states of matter

Date: Tuesday, April 24, 2018 15:00 - 17:00
Speaker: Jürg Fröhlich (ETH Zürich)
Location: Big Seminar room Ground floor / Office Bldg West (I21.EG.101)
Series: Mathematics and CS Seminar
Host: Laszlo Erdös
Lab building west seminar room


Starting with a description of the goals of the analysis and a brief survey of the chiral anomaly, I will review some basic elements of the theory of the quantum Hall effect in 2D electron gases. I will discuss the role of anomalous chiral edge currents and of anomaly inflow in 2D insulators with explicitly or spontaneously broken parity and time reversal, i.e., in incompressible Hall fluids and Chern insulators, respectively. The topological Chern-Simons actions yielding the correct response equations for the 2D bulk of such materials will be exhibited.I will then analyze chiral edge spin-currents and the bulk response equations in time-reversal invariant 2D topological insulators.A short digression into the theory of 3D topological insulators, including axionic insulators, will conclude this talk.

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