Experimental Evidence for Quantum Interference and Vibrationally Induced   Decoherence in Single-Molecule Junctions
  We analyze quantum interference and decoherence effects in single-molecule junctions both experimentally and theoretically by means of the mechanically controlled break junction technique and density-functional theory. We consider the case where interference is provided by overlapping quasi-degenerate states. Decoherence mechanisms arising from the electronic-vibrational coupling strongly affect the electrical current flowing through a single-molecule contact and can be controlled by temperature variation. Our findings underline the all-important relevance of vibrations for understanding charge transport through molecular junctions. 
Stefan Ballmann, Rainer H\"artle, Pedro B. Coto, Marcel Mayor, Mark   Elbing, Martin R. Bryce, Michael Thoss, Heiko B. Weber
cond-mat.mes-hall