Fig. 1: Comparison of population inversion from a conventional optical pumping setup and a current biased tilted Dirac node. | Nature Communications

Fig. 1: Comparison of population inversion from a conventional optical pumping setup and a current biased tilted Dirac node.

From: Plasmonic gain in current biased tilted Dirac nodes

Fig. 1

a Schematic of population inversion achieved by a conventional optical pumping setup is shown. b Schematic of population inversion in current biased tilted Dirac nodes. The blue(red) circles represent transitions that can contribute to emission(absorption) of a plasmon. Note how the transitions in the optically pumped case are reciprocal while for the tilted Dirac node they become non-reciprocal.

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