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Final solution of the last quiz:
correct answer: 2D flake of a lead iodide single crystal
From the publication:
G Grinblat, I Abdelwahab, M P Nielsen, P Dichtl, K Leng, R F Oulton, K P Loh, S A Maier. Ultrafast All-Optical Modulation in 2D Hybrid Perovskites. ACS Nano, 13 (8), pp. 9504-9510, 2019, ISSN: 1936-0851.
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