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A semiconductor exciton memory cell based on a single quantum nanostructure.

Hubert J Krenner1, Craig E Pryor, Jun He

  • 1Materials Department, University of California, Santa Barbara, CA 93106, USA. krenner@engineering.ucsb.edu

Nano Letters
|May 27, 2008
PubMed
Summary
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We demonstrate long-term storage of excitons in quantum posts, a type of nanostructure. By separating electron-hole pairs with an electric field, we inhibited recombination and achieved storage times over 30 milliseconds.

Area of Science:

  • Quantum physics
  • Condensed matter physics
  • Nanotechnology

Background:

  • Excitons are bound states of electrons and holes in semiconductors.
  • Efficient exciton storage is crucial for quantum information processing and optoelectronic devices.
  • Previous methods faced challenges with short storage times and scalability.

Purpose of the Study:

  • To demonstrate exciton storage in a single nanostructure, specifically a self-assembled quantum post.
  • To investigate the mechanisms limiting exciton storage duration.
  • To achieve storage times exceeding 30 milliseconds.

Main Methods:

  • Generating excitons within a self-assembled quantum post.
  • Separating electrons and holes using an electric field to form spatially indirect excitons.

Related Experiment Videos

  • Storing excitons by maintaining the electric field for a defined duration.
  • Reconverting stored excitons to optically active direct excitons by switching the electric field.
  • Detecting emitted light from single nanostructures.

    • Main Results:

    • Successful storage of excitons in a single quantum post nanostructure.
    • Demonstrated storage times exceeding 30 milliseconds.
    • Identified slow electron tunneling out of the quantum post as the primary loss mechanism.
    • Validated findings by comparing experimental data with theoretical models.

    Conclusions:

    • Quantum posts are viable for exciton storage.
    • Electron tunneling is a key factor limiting exciton lifetime in this system.
    • The demonstrated technique shows promise for future quantum technologies.