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Self-organized Quantum Rings: Physical Characterization and Theoretical Modeling

  • V. M. FominEmail author
  • V. N. Gladilin
  • J. T. Devreese
  • P. M. Koenraad
Chapter
Part of the NanoScience and Technology book series (NANO)

Abstract

An adequate modeling of the self-organized quantum rings is possible only on the basis of the modern characterization of those nanostructures. We discuss an atomic-scale analysis of the indium distribution of self-organized InGaAs quantum rings (QRs). The analysis of the shape, size and composition of self-organized InGaAs QRs at the atomic scale reveals that AFM only shows the material coming out of the QDs during the QR formation. The remaining QD material, as observed by Cross-Sectional Scanning Tunneling Microscopy (X-STM), shows an asymmetric indium-rich crater-like shape with a depression rather than an opening at the center and determines the observed ring-like electronic properties of QR structures. A theoretical model of the geometry and materials properties of the self-organized QRs is developed on that basis and the magnetization is calculated as a function of the applied magnetic field. Although the real QR shape differs strongly from an idealized circular-symmetric open-ring structure, Aharonov-Bohm-type oscillations in the magnetization have been predicted to survive. They have been observed using the torsion magnetometry on InGaAs QRs. Examples of prospective applications of QRs are presented that do and do not utilize the topological properties of QRs.

Keywords

Atomic Force Microscopy Persistent Current Quantum Ring Adiabatic Potential Electron Magnetic Moment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • V. M. Fomin
    • 1
    Email author
  • V. N. Gladilin
    • 2
  • J. T. Devreese
    • 2
  • P. M. Koenraad
    • 3
  1. 1.Institute for Integrative NanosciencesIFW DresdenDresdenGermany
  2. 2.Theory of Quantum and Complex SystemsUniversity of AntwerpAntwerpBelgium
  3. 3.Photonics and Semiconductor NanophysicsEindhoven University of TechnologyEindhovenThe Netherlands

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