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Quantum Dots : A Brief Overview

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  1. Introduction
  2. What are quantum dots?
  3. Etched dots
  4. Split metal gates
  5. Self assembled dots
  6. Electronic properties
  7. Applications
  8. Spin based quantum computing
  9. Conclusion
  10. References

Over the past few decades there has been immense interest in Quantum Dots. In this report the author will outline some of the fabrication techniques, basic theory, and a few important properties of QDs. There are various different kinds of Quantum Dots. The author will focus mainly on semiconductor dots.

[...] This is an example of how the tuneable optical properties of quantum dots are used for practical applications. A monolayer of CdSe dots, sandwiched between the Hole Transport Layer and Electron Transport Layer acts as the Emissive Layer. The recombination of holes and electrons gives rise to radiation. The advantage of such a thin recombination layer is that a greater percentage of holes and electrons recombine resulting in much higher efficiency Fig Conclusion Quantum Dots are an emerging area of research and have the scope for many novel applications. We have [...]

[...] This can be summarized using the Heisenberg uncertainty relation as : Fig Fig Fig ?E?T=(e2/C)(RC)>h Or R>h/e2 In Fig 8 we see a schematic with ?(left/right) being the chemical potential of the drain/source. The solid lines indicate occupied energy levels and the dashed lines indicate unoccupied ones. As the gate voltage Vg is changed an unoccupied level lines up with ?(left/right) leading to charge degeneracy. As a result there is current flow through the dot. However despite a finite drain source voltage Vsd=(?left - ?right)/e, if the chemical potentials are not aligned there can be no flow of electrons. [...]

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