Electronic dispersion

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I am not being able to understand what is the electronic dispersion exactly, I have came across it in few papers and I haven't find any resource that explained it clearly and simply.
I am not being able to understand what is the electronic dispersion exactly, I have came across it in few papers and I haven't find any resource that explained it clearly and simply.
I've came across 'the electronic dispersion is linear' and 'electronic dispersion is parabolic' and some graphs about it but I still didn't understand what is this electronic dispersion exactly, how do we get it and why it is so important
 

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Demystifier
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I've came across 'the electronic dispersion is linear' and 'electronic dispersion is parabolic'
Sound like it is just the dispersion relation (formula that expresses frequency as a function of wave vector ##k##) for electrons.
 
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