The advent of terahertz spectroscopy schemes that offer single-photon sensitivity, femtosecond time resolution and nanometre spatial resolution is creating new opportunities for investigating ultrafast charge dynamics in semiconductor structures.
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Shigekawa, H., Yoshida, S. & Takeuchi, O. Nanoscale terahertz spectroscopy. Nature Photon 8, 815–817 (2014). https://doi.org/10.1038/nphoton.2014.272
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DOI: https://doi.org/10.1038/nphoton.2014.272
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