Which mechanism limits conductive current through a nanoscale metallic point contact between two electrodes?

💡 Explanation

When a metallic contact is reduced to nanoscale dimensions, the electron wavelength becomes comparable to the contact size, leading to the quantization of electron transport channels because of electron confinement, which restricts the number of available conduction pathways. Therefore quantization limits current flow, rather than phonon scattering, plasmon losses or electromigration which require larger scale structural impacts.

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