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Related Experiment Videos

Tunable noise cross correlations in a double quantum dot.

D T McClure1, L Dicarlo, Y Zhang

  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.

Physical Review Letters
|March 16, 2007
PubMed
Summary
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Researchers measured current fluctuations in coupled quantum dots. The cross-spectral density

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic systems

Background:

  • Quantum dots are semiconductor nanocrystals with tunable electronic properties.
  • Coulomb blockade describes the energy cost of adding an electron to a small conductor.
  • Capacitive coupling allows charge interaction between adjacent quantum dots.

Purpose of the Study:

  • To investigate the cross-correlation of temporal current fluctuations in coupled quantum dots.
  • To explore the tunability of the cross-spectral density via external gate voltage and bias.
  • To validate theoretical models against experimental observations.

Main Methods:

  • Fabrication and measurement of two capacitively coupled quantum dots.
  • Utilizing Coulomb blockade conditions for controlled electron transport.

Related Experiment Videos

  • Measuring temporal current fluctuations and their cross-correlation.
  • Analyzing the cross-spectral density as a function of gate voltage and source-drain bias.

    • Main Results:

    • Demonstrated tunable sign of the cross-spectral density.
    • Observed dependence of the cross-correlation on gate voltage and source-drain bias.
    • Achieved good agreement between experimental data and theoretical predictions.

    Conclusions:

    • The interdot Coulomb interaction plays a crucial role in coupled quantum dot systems.
    • Sequential tunneling model with interdot interaction accurately describes the observed correlations.
    • This work provides insights into charge transport and correlations in mesoscopic devices.