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MATERIAL WITNESS news & views 3. Splendiani, A. et al. Nano Lett. 10, 1271–1275 of different materials with varying twist Arbor, MI, USA. (2010). angles. From an applied perspective, charge e-mail: cundiff@umich.edu 4. Merkl, P. et al. Nat. Mater. https://doi.org/10.1038/s41563-019- separation is a critical first step in converting 0337-0 (2019). Published online: 19 June 2019 optical excitation into a charge that can 5. Qiu, D. Y., da Jornada, F. H. & Louie, S. G....