Transport Properties Characterization of Individual Molecule Device Using Noise Spectroscopy: A New Approach.

We studied the noise properties of break junction devices with and without a single 1,4-benzeneditiol molecule. Two noise components were registered in all noise spectra: thermal noise and flicker noise. In addition, a Lorentzian-shape (1/f²) noise component was revealed for the molecular junctions only. The characteristic frequency of the Lorentzian-shape noise depends linearly on current through the molecular junction. These results are in good agreement with the proposed phenomenological model. [ABSTRACT FROM AUTHOR]