Solving 8 Band k.p Model for AlxGa1-xAs/GaAs QW

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Discussion Overview

The discussion revolves around the challenges and discrepancies encountered while using the 8 band k.p method to model the band structure of AlxGa1-xAs/GaAs quantum wells and other semiconductor heterostructures. Participants are seeking assistance with coding issues, theoretical references, and comparisons of results.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant reports a significant discrepancy in the conduction band energy for Al0.25Ga0.75As/GaAs, suggesting their results differ from established sources.
  • Another participant suggests that variations in the 8x8 k.p method could lead to different results and requests the original code or theoretical references used.
  • A participant expresses a need for MATLAB files and assistance in identifying issues within their code related to a 4x4 valence band k.p model.
  • Another participant mentions working on band structures of superlattices and requests a version of the program to compare results.
  • One participant seeks help with modeling a type II GaSb/InAs superlattice and requests sample code due to a lack of coding background.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the source of discrepancies in their results, and multiple competing views regarding the implementation of the k.p method and coding practices remain. The discussion is unresolved.

Contextual Notes

Participants mention various versions of the k.p method and express uncertainty about the correctness of their implementations. There are references to specific parameters and configurations that may affect results, but no definitive conclusions are drawn.

Who May Find This Useful

This discussion may be useful for researchers and students working on semiconductor physics, particularly those interested in quantum well structures and the k.p method for band structure calculations.

rezaoliaee
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hi ,
I am working on bandstructure of AlxGa1-xAs/GaAs Quantum well with 8 band k.p method , but the results for CB,LH,HH and spin orbit splitting are different from other sources, for example CB energy for Al0.25Ga0.75As/GaAs
(barrier and well width=50 A) with my program is 49.83 meV whereas the correct result is 73.175 meV.I have worked about two weeks to troubleshoot every mistake that might be there in the program but I really don,t know what is the source of problem ?
I will be so happy that someone help me or introduce the complete reference about the 8 band k.p method for Quantum wells .
 
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Post your code or reference to the theory that you are using, there are many [itex]8\times 8 \vec{k}*\vec{p}[/itex] variants. I can think of things you may not have done that will affect your answers significantly.
 
hi,
Thanks for your response.

I sent 4*4 valence band k.p model MATLAB files and articles that I have used.please response me, what's the problem of codes and if possible send me another MATLAB file that I can use it for compare.

Thanks.
Best regards.
 

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rezaoliaee said:
hi,
Thanks for your response.

I sent 4*4 valence band k.p model MATLAB files and articles that I have used.please response me, what's the problem of codes and if possible send me another MATLAB file that I can use it for compare.

Thanks.
Best regards.

It'll take me a little time to look thru everything. It has been a while since I looked at these problems (5-10 years or so).
 
Hi, I am working on band structure of SC heterostructures using 8x8 K.P method and i do have some variations in experimental results. can anyone please help me by sending me his version of the program. Thank you.
 
Hi, I am trying to model a type II GaSb/InAs superlattice through the 8 band k.p method in MATLAB...I have studied general quantum mechanics but have no background in coding. I need to calculate the bandstructure and the CB,VB wavefunctions...can anyone provide me with a sample code for better understanding?? thank you.
 

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