Quantum Dot Solids: Electron Minibands & Potential

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SUMMARY

Electron minibands in quantum dot solids do possess potential energy states, emerging from the overlapping energy states of coupled quantum dots. This phenomenon is analogous to the formation of energy bands in bulk materials due to overlapping atomic orbitals. In a scenario involving a 5-micron thick quantum dot solid on a ground plane with a c-AFM probe tip at a -10 V bias, the transient field generated upon contact can lead to exciton formation. This can result in unexpected positive currents into the probe tip, contrary to the anticipated negative currents.

PREREQUISITES
  • Understanding of quantum dot solids and their structure
  • Familiarity with electron minibands and energy states
  • Knowledge of conductive atomic force microscopy (c-AFM) techniques
  • Basic principles of exciton formation and electron transport
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  • Research the formation of minibands in quantum dot crystals
  • Explore the principles of exciton dynamics in semiconductor materials
  • Study the effects of electric fields on electron transport in quantum dot systems
  • Investigate the operational principles of conductive atomic force microscopy (c-AFM)
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Researchers in condensed matter physics, materials scientists, and engineers working on quantum dot technologies and electron transport phenomena.

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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