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Related Experiment Videos

Electron cotunneling in a semiconductor quantum dot.

S De Franceschi1, S Sasaki, J M Elzerman

  • 1Department of Applied Physics, DIMES, Delft University of Technology, The Netherlands.

Physical Review Letters
|February 15, 2001
PubMed
Summary

We measured electron transport in semiconductor quantum dots, distinguishing between elastic and inelastic cotunneling. Inelastic cotunneling occurs only when bias exceeds the lowest excitation energy, aiding energy-level spectroscopy.

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Area of Science:

  • Quantum physics
  • Condensed matter physics

Background:

  • Semiconductor quantum dots confine electrons, enabling quantum phenomena study.
  • Coulomb blockade limits current flow, with cotunneling as a key transport mechanism.

Purpose of the Study:

  • To investigate cotunneling processes in semiconductor quantum dots.
  • To differentiate between elastic and inelastic cotunneling.
  • To explore implications for energy-level spectroscopy.

Main Methods:

  • Transport measurements on a semiconductor quantum dot.
  • Analysis of conduction in the Coulomb blockade regime.
  • Discrimination between elastic and inelastic cotunneling events.

Main Results:

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  • Conduction is dominated by cotunneling in the Coulomb blockade regime.
  • Elastic and inelastic cotunneling processes were identified.
  • Inelastic cotunneling was observed only when applied bias surpassed the lowest excitation energy.

    • Conclusions:

    • The study successfully differentiates elastic and inelastic cotunneling.
    • The findings provide a method for energy-level spectroscopy in quantum dots.
    • Understanding cotunneling is crucial for quantum device applications.