At top, an illustration shows the experimental setup developed at Rice University to study the effect of how current prompts localized surface plasmons (LSPs) to produce hot carriers in the nanogap between two electrodes. Center, a photo shows a light-emitting tunnel junction between two gold electrodes with input from 1 to 1.2 volts. At bottom, a spectrographic plot shows the photon energy and intensity produced at the junction. (Credit: Natelson Research Group/Rice University)

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