Working in collaboration with the Wu lab from U. Penn and several theory groups, we have shown that measurements of the circular photogalvanic effect (CPGE) in CoSi, a topological semimetal, are consistent with theory and prove that the observation of the quantized CPGE measuring the topological charge of a node should be feasible with the right material tuning. Congrats to Oscar who did great work leading the effective model calculations! And as usual in close collaboration with Adolfo Gruhsin too. Check out the paper published in Nature Communications!