Shot noise measurements on a single molecule

We report measurements of shot noise in the current through a single D-2 molecule. The molecular junctions were formed by means of the mechanically controllable break junction technique. The configuration of the D-2 molecule bridging the gap between two Pt tips is verified by use of point contact spectroscopy. Maintaining the same junction shot noise measurements were performed and the observed quantum suppression shows that conductance is carried dominantly by a single, almost fully transparent conductance channel. This observation allows us to decide between conflicting model calculations for this system, and this may serve as a benchmark for further computations on molecular junctions.