By applying an extremely large magnetic field to break a semiconductor's energy bands into discrete levels, researchers have shown that it is possible for terahertz quantum cascade lasers to operate at unprecedented temperatures and wavelengths.
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Sirtori, C. Breaking energy bands. Nature Photon 3, 13–15 (2009). https://doi.org/10.1038/nphoton.2008.262
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DOI: https://doi.org/10.1038/nphoton.2008.262
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