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Related Experiment Videos

The Coulomb Blockade in Coupled Quantum Dots

Livermore1, Crouch, Westervelt

  • 1C. Livermore, C. H. Crouch, R. M. Westervelt, Division of Applied Sciences and Department of Physics, Harvard University, Cambridge, MA 02138, USA. K. L. Campman and A. C. Gossard, Materials Department, University of California, Santa Barbara, CA 93106, USA.

Science (New York, N.Y.)
|November 22, 1996
PubMed
Summary

Researchers studied artificial molecules formed by two tunnel-coupled quantum dots. Adjusting the tunnel conductance revealed significant changes in conductance peaks, aligning with many-body theory predictions for these quantum systems.

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Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Individual quantum dots are analogous to artificial atoms.
  • Coupled quantum dots form artificial molecules, offering tunable electronic properties.

Purpose of the Study:

  • Investigate the electronic properties of a double quantum dot system.
  • Determine the ground-state charge configuration as a function of interdot tunnel conductance and gate-induced polarization.

Main Methods:

  • Fabrication of a double quantum dot in a gallium arsenide-aluminum gallium arsenide heterostructure.
  • Low-temperature measurements utilizing Coulomb blockade.
  • Systematic variation of interdot tunnel conductance.

Main Results:

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  • Observed pronounced changes in conductance peaks with increasing tunnel conductance.
  • Experimental results show agreement with many-body theory predictions.
  • Ground-state charge configuration was mapped as a function of total charge and interdot polarization.

Conclusions:

  • The behavior of artificial molecules in double quantum dots is sensitive to interdot tunnel coupling.
  • Many-body theory accurately describes the observed quantum phenomena in these systems.
  • Tunable interdot coupling provides a method to control charge configurations in artificial molecules.