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Self-organized Formation and XSTM-Characterization of GaSb/GaAs Quantum Rings

  • Andrea LenzEmail author
  • Holger Eisele
Chapter
Part of the NanoScience and Technology book series (NANO)

Abstract

In this chapter we discuss the details of the spatial structure of GaSb/GaAs(001) quantum rings, and how the observed nanostructures were achieved during the self-assembled growth and formation process. In contrast to the In(Ga)As/GaAs material system, for which thin capping of quantum dots followed by a longer growth interruption is necessary to initiate the quantum-dot to quantum-ring transformation, GaSb quantum rings occur already after the material deposition on GaAs(001), sometimes even without capping. Upon capping almost all quantum dots are transformed into quantum rings. The GaSb quantum rings are found to exhibit a clear central opening, which is filled by the pure GaAs capping material. The more direct formation process of the GaSb/GaAs(001) quantum rings can be understood by analyzing the details of the energies acting during the self-assembled growth. Hence, these more distinct quantum-ring structures are even more promising to show corresponding electronic states, as e.g., the Aharonov-Bohm effect.

Keywords

Metal Organic Chemical Vapor Deposition Strain Relaxation Dangling Bond Atom Probe Tomography Quantum Ring 
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.

Notes

Acknowledgements

The authors would like to thank Rainer Timm for XSTM work and analysis, Mario Dähne for fruitful discussion, the Deutsche Forschungsgemeinschaft DFG for the financial support by the collaborative research centers Sfb 296, Sfb 787, by the projects No. Da 408/4, Da 408/8, Da 408/13, and by the SANDiE NoE of the European Commission. One of the authors (H.E.) acknowledge financial support from the Alexander von Humboldt-Foundation.

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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Institut für FestkörperphysikTechnische Universität BerlinBerlinGermany

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