Transferring electrons from the ground state to an excited state by optical pumping usually increases the population of the upper state. But for graphene in an external magnetic field, the pumped state actually gets depleted.
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Gierz, I. A fool's errand. Nature Phys 11, 12–13 (2015). https://doi.org/10.1038/nphys3206
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DOI: https://doi.org/10.1038/nphys3206
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Towards a tunable graphene-based Landau level laser in the terahertz regime
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