Minibands and Minigaps in Quantum Cascade lasers

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Summary:

What is the structure and how are minibands and minigaps in QC Lasers implemented

Main Question or Discussion Point

Summary:: What is the structure and how are minibands and minigaps in QC Lasers implemented

Hello everybody,

I have a question regarding the miniband and minigaps that are displayed widely in diagrams about the functioning of Quantum Cascade Lasers. How are this mini-gaps established physically? And what is there effect?

Thanks in advance
 

Answers and Replies

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I'm not an expert on quantum cascade lasers, but I understand band structures.

I've looked at some images. Aren't all these diagrams just a series of square wells with an electric potential across them? Thus the gaps are just band gaps in the finite-size material?

If I am correct then this simulation should be conceptually helpful: https://phet.colorado.edu/en/simulation/legacy/band-structure. You can modify the band structure and even apply an electric potential across it.
 

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