Quantum Dot Solids: Electron Minibands & Potential

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Discussion Overview

The discussion revolves around the concept of electron minibands in quantum dot solids and their associated potentials. Participants explore the formation of minibands, the conditions under which they arise, and the implications for electron transport in experimental setups.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant questions whether electron minibands in quantum dot solids possess a potential.
  • Another participant requests clarification on the initial question, suggesting that more context would lead to better answers.
  • A different participant references a research paper related to miniband formation and emphasizes the importance of citing sources for clarity.
  • It is noted that minibands arise from overlapping energy states of coupling quantum dots, similar to energy bands in bulk materials, indicating that potentials are indeed present, though the specifics of the potential in question remain unclear.
  • A scenario is presented involving a quantum dot solid with a c-AFM probe tip at a -10 V bias, questioning whether the transient field from the probe tip could lead to positive currents due to exciton formation, rather than the expected negative currents.
  • One participant offers to provide additional information if needed.

Areas of Agreement / Disagreement

Participants express differing levels of understanding and clarity regarding the initial question about potentials in electron minibands. The discussion includes multiple viewpoints on the nature of minibands and their implications for electron transport, indicating that no consensus has been reached.

Contextual Notes

The discussion highlights potential limitations in the initial question's accuracy and the need for more specific details regarding the potentials being referenced. The scenario presented introduces additional complexity that may not have been fully explored.

Christopher Rourk
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Do electron minibands in quantum dot solids have a potential?
 
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Hi

Could you give us some more information about your question?
 
It looks like you are doing some reading - good! But if you can tell us what you were reading - akin to the concept of a legal citation - the format does not matter. Good questions get good answers.
 
See https://www.researchgate.net/publication/234963173_Miniband_formation_in_a_quantum_dot_crystal. But its for interpreting some test results.
 
I haven't read the full paper because your question is still not accurate enough to give a satisfying answer. The minibands emerge from overlapping energy states of the coupling quantum dots. Similar to the bulk material energy bands that emerge from overlapping atomic orbitals. These (mini)bands are describing potential energy states so of course there are potentials. The question is what potential between what states or bands are you asking for?
 
Assume a 5 micron thick quantum dot solid, disposed on a ground plane, and a c-AFM probe tip at a -10 V bias. If the transient field generated as the probe tip comes into contact with the quantum dot solid causes excitons to form, could electron transport explain the generation of transient positive currents into the -10 V biased probe tip, as opposed to expected negative currents flowing out of the probe tip?
 
Let me know if you need additional info.
 

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