Electron relaxation time in semiconductor quantum dots, for terahertz transition energies, can be slowed down to the nanosecond range — a very encouraging result for the development of quantum-dot-based quantum cascade lasers.
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Tredicucci, A. Long life in zero dimensions. Nature Mater 8, 775–776 (2009). https://doi.org/10.1038/nmat2541
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DOI: https://doi.org/10.1038/nmat2541
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