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Multiple cotunneling in large quantum dot arrays.

T B Tran1, I S Beloborodov, X M Lin

  • 1James Franck Institute, University of Chicago, Illinois 60637, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary

Inelastic cotunneling significantly impacts electronic transport in gold nanoparticle films, revealing Efros-Shklovskii variable range hopping. The hopping distance correlates with current-voltage characteristics in mesoscopic conductors.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Understanding electronic transport in nanostructured materials is crucial.
  • Coulomb blockade effects dominate transport in granular conductors at low temperatures.
  • Inelastic cotunneling is a key quantum transport phenomenon.

Purpose of the Study:

  • To investigate the influence of inelastic cotunneling on electronic transport properties.
  • To analyze transport in gold nanoparticle multilayers and thick films within the Coulomb blockade regime.
  • To relate hopping transport characteristics to cotunneling events.

Main Methods:

  • Experimental investigation of electronic transport properties.
  • Measurement of zero-bias conductance (g(0)(T)) as a function of temperature.

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  • Analysis of current-voltage (I-V) characteristics to determine power-law exponents.
  • Comparison with theoretical models of cotunneling and hopping transport.

    • Main Results:

    • Observed Efros-Shklovskii-type variable range hopping transport in all studied systems.
    • Determined a direct relationship between typical hopping distance and the power-law exponent in I-V characteristics.
    • Identified the typical hopping distance as the number of tunnel junctions involved in cotunneling.

    Conclusions:

    • Inelastic cotunneling plays a significant role in the electronic transport of gold nanoparticle systems.
    • The observed transport mechanism is consistent with Efros-Shklovskii variable range hopping.
    • Findings provide insights into cotunneling and hopping transport in mesoscopic granular conductors.