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Quantized optical responses in chiral insulators and metals

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If you have a question about this talk, please contact Katarzyna Macieszczak.

In this talk I will discuss how optical experiments can measure quantized observables, determined solely by fundamental constants. I will discuss two effects triggered by circular polarized light: circular dichroism, and the circular photogalvanic effect. The former is a linear response that is quantized in higher order topological insulators with chiral hinge modes. The latter is a non-linear response that is quantized in Weyl semimetals where all mirror symmetries are broken. I will discuss how these probes can be used to distinguish these phases from trivial states, and some of the subtleties to interpret experiments capable of measuring them.

This talk is part of the Theory of Condensed Matter series.

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