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The Landau level laser has been proposed a long time ago as a unique sourceof monochromatic radiation, widely tunable in the THz and infrared spectralranges using an externally applied magnetic field. In spite of decades ofefforts, this appealing concept never resulted in the design of a reliabledevice. This is due to efficient Auger scattering of Landau-quantizedelectrons, which is an intrinsic non-radiative recombination channel thateventually gains over cyclotron emission in all materials studied so far: inconventional semiconductors with parabolic bands, but also in graphene withmassless electrons. The Auger processes are favored in these systems by Landaulevels (or their subsets) equally spaced in energy. Here we show that thisscheme does not apply to massless Kane electrons in gapless HgCdTe alloy, inwhich undesirable Auger scattering is strongly suppressed and the sizeablecyclotron emission observed, for the first time in the case of masslessparticles. The gapless HgCdTe thus appears as a material of choice for futuretechnology of Landau level lasers.

Suppressed Auger scattering and tunable light emission of Landau-quantized massless Kane electrons