Because of near-instant screening, photoexcited electron–hole pairs in metals are hard to investigate experimentally. Femtosecond spectroscopy is now shown to be a viable tool for studying them — and reveals the existence of 'transient excitons'.
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Miller, T. Exciting and revealing. Nature Phys 10, 480–481 (2014). https://doi.org/10.1038/nphys3019
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DOI: https://doi.org/10.1038/nphys3019
