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Current noise in ac-driven nanoscale conductors.

Sébastien Camalet1, Jörg Lehmann, Sigmund Kohler

  • 1Institut für Physik, Universität Augsburg, Universitätsstrasse 1, D-86135 Augsburg, Germany.

Physical Review Letters
|June 6, 2003
PubMed
Summary

We present a theory for current fluctuations in nanoscale systems driven by alternating current (ac). Tailored ac fields can suppress both direct current (dc) and noise, allowing manipulation of transport noise via the Fano factor.

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Area of Science:

  • Quantum transport phenomena
  • Mesoscopic physics
  • Nanoscale electronic devices

Background:

  • Understanding charge transport in nanoscale systems is crucial for developing advanced electronic devices.
  • Alternating current (ac) driving offers unique control over quantum transport properties.
  • Characterizing current fluctuations (noise) is essential for device performance and stability.

Purpose of the Study:

  • To develop a theoretical framework for current fluctuations in ac-driven nanoscale transport.
  • To derive explicit expressions for time-averaged current and zero-frequency noise power spectrum.
  • To investigate the influence of tailored ac fields on transport properties and noise levels.

Main Methods:

  • Generalized, non-Hermitian Floquet theory applied to ac-driven quantum transport.

Related Experiment Videos

  • Derivation of analytical expressions for current and noise power spectrum.
  • Analysis of the Fano factor as a measure of transport noise.

    • Main Results:

    • Novel explicit expressions for time-averaged current and zero-frequency noise power spectrum derived.
    • Demonstrated distinct suppression of both zero-frequency noise and dc current with tailored ac fields.
    • Showcased selective manipulation of transport noise (Fano factor) by ac sources, revealing characteristic maxima and minima near current suppression.

    Conclusions:

    • The developed theory provides a powerful tool for understanding and controlling quantum transport in nanoscale systems.
    • Tailored ac fields offer a promising route for noise suppression and noise manipulation in nanoscale devices.
    • The Fano factor can be precisely tuned, opening possibilities for novel noise-engineered electronic functionalities.