Three-Dimensional Control of Self-Assembled Quantum Dot Configurations

Abstract

We demonstrate techniques for growing three-dimensional quantum dot configurations using molecular beam epitaxy on faceted template islands. Molecular beam shadowing leads to new geometries through selective nucleation of the dots on the template edges. Strain-induced stacking converts the planar configurations into three-dimensional structures. The resulting dot morphologies and their configurational uniformity are studied using cross sectional scanning tunneling microscopy and atomic force microscopy. Combining photoluminescence measurements with structural characterization allows interpretation of the ensemble photoluminescence spectrum. Bright spectra for the three-dimensional structures suggest an improved method for combining lithographic nucleation sites with self-assembled dot growth. These techniques can be applied to lithographic templates to fabricate complex quantum dot networks.

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Document Details

Document Type
Technical Report
Publication Date
Jun 17, 2010
Accession Number
ADA554804

Entities

People

  • Allan S. Bracker
  • Cory D. Cress
  • Joseph G Tischler
  • Michael K. Yakes

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Epitaxial Growth
  • Geometry
  • Low Temperature
  • Materials
  • Measurement
  • Microscopy
  • Molecular Beam Epitaxy
  • Molecular Beams
  • Nucleation
  • Photoluminescence
  • Quantum Dots
  • Quantum Tunneling
  • Spectra
  • Template Patterns
  • Three Dimensional
  • Tunneling

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Nanofabrication and Microfabrication.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.

Technology Areas

  • Quantum Computing