Which mechanism limits current flow through nanoscale tunnel junctions at sufficiently high voltage?

💡 Explanation

At higher voltages in tunnel junctions, injected electrons gain energy, leading to increased probability of phonon emission; resonant phonon modes enhance electron scattering and dissipate energy, limiting current flow. Therefore resonant enhancement of phonon scattering limits current, rather than space charge, interference, or hot electron effects that dominate under different conditions.

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