- #1
qiub
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Hi, I'm trying to distinguish phonon branches in the case of branch crossings in some complex phonon dispersions, like in the below example:
http://cmt.dur.ac.uk/sjc/thesis/thesis/img354.gif
My question is, how can I know which portions near the crossing belong to the same branch? I've this question because when I want to calculate group velocity, it becomes quite confusing, please help me, thanks!
http://cmt.dur.ac.uk/sjc/thesis/thesis/img354.gif
My question is, how can I know which portions near the crossing belong to the same branch? I've this question because when I want to calculate group velocity, it becomes quite confusing, please help me, thanks!