Noise and transport characterization of single molecular break junctions with individual molecule

Research output: Contribution to journalArticlepeer-review

Authors

  • V. A. Sydoruk
  • D. Xiang
  • S. A. Vitusevich
  • M. V. Petrychuk
  • Yi Zhang
  • A. Offenhäusser
  • V. A. Kochelap
  • A. E. Belyaev
  • Dirk Mayer

Colleges, School and Institutes

Abstract

We studied the noise spectra of molecule-free and molecule-containing mechanically controllable break junctions. Both types of junctions revealed typical 1/fnoisecharacteristics 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 2noise related to a single bridging molecule correlates with the lock-in current amplitudes. The recorded behavior of Lorentzian-shape noise component as a function of current is interpreted as the manifestation of a dynamic reconfiguration of molecular coupling to the metal electrodes. We propose a phenomenological model that correlates the chargetransport 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.

Details

Original languageEnglish
Pages (from-to)14908
Number of pages1
JournalJournal of Applied Physics
Volume112
Issue number1
Publication statusPublished - 2012

Keywords

  • noise