Shot noise variation within ensembles of gold atomic break junctions at room temperature.

摘要: Atomic-scale junctions are a powerful tool to study quantum transport, and frequently examined through the mechanically controllable break junction technique. The junction-to-junction variation of atomic configurations often leads statistical approach, with ensemble-averaged properties providing access relevant physics. However, full ensemble contains considerable additional information. We report new analysis shot noise over entire ensembles using scanning tunneling microscope-style gold at room temperature in ambient conditions, compare these data simulations based on molecular dynamics, sophisticated tight-binding model, nonequilibrium Green's functions. experimental show suppression near conductances dominated by fully transmitting channels, surprising participation multiple channels nominal regime. Comparison simulations, which agree well published work low temperatures ultrahigh vacuum suggests that effects likely result from surface contamination disorder electrodes. propose experiments can distinguish relative contributions factors.