A theory shows that narrow HgCdTe quantum wells, whose electron-hole dispersion is nearly Dirac-like, suppress Auger recombination enough to allow lasing at wavelengths up to about 50 microns at 77 K with low threshold currents.
High power InAsSb/InAsSbP double heterostructure laser for continuous wave operation at 3.6 m https://pdfs.semanticscholar.org/91aa/f71401e995197872634bce58b1050cca7b0d.pdf
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Fundamental limits to far-infrared lasing in Auger-suppressed HgCdTe quantum wells
A theory shows that narrow HgCdTe quantum wells, whose electron-hole dispersion is nearly Dirac-like, suppress Auger recombination enough to allow lasing at wavelengths up to about 50 microns at 77 K with low threshold currents.