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Noise and Transport Characterization of Single Molecular Break Junctions with Individual Molecule

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Noise and Transport Characterization of Single Molecular Break Junctions with Individual Molecule The voltage noise power spectral density of a single molecule (1,4-benzenediamine) molecule bridging two nanoelectrodes. The solid gray curve is the measured noise density and the solid black curve presents the model fitting. The fitting curve is the superposition of 1/ f, 1/ f^2 and thermal noise components shown by a dash-dotted line, dashed curve, and thin gray line, respectively.

V.A. Sydoruk, D. Xiang, S.A.Vitusevich, M.V. Petrychuk, A.Vladyka, Y. Zhang, A. Offenhäusser, V.A. Kochelap, A.E. Belyaev, and D. Mayer

 

Abstract: We studied the noise spectra of molecule-free and molecule-containing mechanically controllable break junctions. Both types of junctions revealed typical 1/ f noise characteristics at different distances between the contacts with square dependence of current noise power spectral density on current.  Additional Lorentzian-shape (1/ f 2) noise components were recorded only when nanoelectrodes were bridged by individual 1,4-benzenediamine molecule. The characteristic frequency of the revealed 1/ f 2 noise related to a single bridging molecule correlates with the lock-in current amplitudes. We propose a phenomenological model that correlates the charge transport via a single molecule with the reconfiguration of its coupling to the metal electrodes. Experimentally obtained results are in good agreement with theoretical ones and indicate that coupling between the molecule metal electrodes is important aspect that should be taken into account.

J. Appl. Phys. 112, 014908 (2012); doi: 10.1063/1.4736558, online: July 2012



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