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Related Experiment Videos

An adiabatic quantum electron pump

Switkes1, Marcus, Campman

  • 1Department of Physics, Stanford University, Stanford, CA 94305, USA. Materials Department, University of California, Santa Barbara, CA 93106, USA.

Science (New York, N.Y.)
|March 19, 1999
PubMed
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Researchers demonstrated a quantum pumping mechanism in open quantum dots, generating DC current or voltage via cyclic potential deformation. The output voltage fluctuates with external parameters but scales with deformation frequency.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Mesoscopic systems

Background:

  • Quantum dots are semiconductor nanostructures exhibiting quantum mechanical properties.
  • Quantum pumping is a method to induce directed charge transport using time-dependent potentials.
  • Open quantum dots allow for controlled interaction with external leads.

Purpose of the Study:

  • To investigate a novel quantum pumping mechanism in open quantum dots.
  • To characterize the generated DC current and voltage under cyclic potential deformation.
  • To explore the influence of external parameters on the pumping efficiency.

Main Methods:

  • Utilizing cyclic deformation of the confining potential in an open quantum dot.
  • Applying two AC voltages to modulate the quantum dot potential.

Related Experiment Videos

  • Measuring DC current and voltage output under varying conditions (magnetic field, temperature).

    • Main Results:

    • A DC voltage is produced in response to cyclic potential deformation.
    • The output voltage exhibits sinusoidal dependence on the phase difference of AC voltages.
    • Voltage amplitude shows linear dependence on deformation frequency and fluctuates with external parameters.
    • Dependencies on deformation strength, temperature, and time-reversal symmetry breaking were analyzed.

    Conclusions:

    • The study reports a functional quantum pumping mechanism in open quantum dots.
    • The findings highlight the sensitivity of quantum pumping to external parameters and deformation characteristics.
    • This mechanism offers potential for precise control of charge transport at the nanoscale.