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SUMMARY:Quantized optical responses in chiral insulators and metals - Dr A
 dolfo G. Grushin
DTSTART:20200123T141500Z
DTEND:20200123T151500Z
UID:TALK127549@talks.cam.ac.uk
CONTACT:Katarzyna Macieszczak
DESCRIPTION:In this talk I will discuss how optical experiments can measur
 e quantized observables\, determined solely by fundamental constants.\nI w
 ill discuss two effects triggered by circular polarized light: circular di
 chroism\, and the circular photogalvanic effect. The former is a linear re
 sponse that is quantized in higher order topological insulators with chira
 l hinge modes. The latter is a non-linear response that is quantized in We
 yl semimetals where all mirror symmetries are broken. I will discuss how t
 hese probes can be used to distinguish these phases from trivial states\, 
 and some of the subtleties to interpret experiments capable of measuring t
 hem.\n
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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