Coulomb Blockade & Single Electron Transistors Explained

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Discussion Overview

The discussion revolves around the concept of Coulomb blockade and its relevance to Single Electron Transistors (SETs). Participants explore the mechanisms behind Coulomb blockade, its implications for electron trapping, and the operational principles of SETs.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant requests clarification on Coulomb blockade and its connection to Single Electron Transistors.
  • Another suggests consulting Tinkham's "Introduction to superconductivity" for a detailed explanation of small junctions related to the topic.
  • A link to a Wikipedia article on Coulomb blockade is shared as a resource.
  • A participant describes the mechanism of trapping an electron in a quantum dot and how it creates a repulsive potential barrier for additional electrons due to Coulomb repulsion, explaining the role of gate electrodes in manipulating the potential to allow further electron trapping.

Areas of Agreement / Disagreement

There is no explicit consensus among participants, as the discussion includes requests for information, resource suggestions, and explanations of mechanisms without resolving any disagreements or uncertainties.

Contextual Notes

The discussion does not address specific assumptions or limitations regarding the definitions of Coulomb blockade or Single Electron Transistors, nor does it delve into the mathematical details of the concepts presented.

Who May Find This Useful

Individuals interested in quantum mechanics, condensed matter physics, and the design and operation of electronic devices at the nanoscale may find this discussion relevant.

tianyi.tan
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Hello! Can someone please enlighten me about coulomb blockade & how its relevant to Single Electron Transistors? Thanks :))
 
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Try to find a copy of Tinkham's "Introduction to superconductivity", it is explained quite well in the chapter on small junctions.
 
If you trap 1 electron in a dot between two leads ----o---- it will cause a repulsive potential barrier for another electron that could have been trapped there -to high, so it cannot be trapped -Its blocked by coulomb repulsion. To overcome this you lower the potential close to the dot with a gate electrode, and now the electron 2 could be trapped also. But the 3:d electron is blocked from the 2 electrons to be trapped, so you must lower the gate potential again, and so on.
 

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