This is a type of textbook question, that means the complete answer takes more 
than one textbook
it will depend on how much you know about electronic structure, symmetry and 
group theory, as well as topology.

In the forum one can answer how to do things or comment on small questions, 
why you calculated the band structure of something is a question that you have 
to ask yourself.

In short, the irreducible representation tells you which symmetry a band has, 
this has mostly nothing to do with its shape.
In an anylysis of the electronic structure of a semiconductor about its 
topological character (trivial or non trivial) you might like to check first
whether  band inversion occurs that is whether the energies of bands with 
distinguished energies are "regular" or "reversed",
more details will depend on the system you are looking on, and its impossible 
to give here all possibilities for every crystal structiure that might occur.
In certain cases you will have to check the symmetry of the bands not only at 
Gamma but also at other high symmetry points.
Therfore, please check the textbooks and literature.


DEEP THOUGHT in D. Adams; Hitchhikers Guide to the Galaxy:
"I think the problem, to be quite honest with you,
is that you have never actually known what the question is."

Dr. Gerhard H. Fecher
Institut of Inorganic and Analytical Chemistry
Johannes Gutenberg - University
55099 Mainz
Max Planck Institute for Chemical Physics of Solids
01187 Dresden
[] im Auftrag von emami seyyed amir 
abbas []
Gesendet: Montag, 26. Oktober 2015 20:57
Betreff: Re: [Wien] Band labeling

Thank you very much for your helpful responds.

What i realized is that for obtaining more details such as band labeling i need 
to run irrep. As you said for topological characterization, it is necessary to 
obtain band structures in irreducible representation. Is there any difference 
in shape of bands between normal band and ones obtained in irreducible? In 
other words why you mentioned it is requires to plot the bands in irreducible 
representations. I will be very grateful if i find my answer.

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