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Author Topic: Calculation of group velocity v_LA and v_TA from phonon band structure  (Read 1987 times)

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Offline shivgy

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Calculation of group velocity v_LA and v_TA from phonon band structure
« on: June 19, 2014, 09:33 »
How can we calculate group velocity for LA (Longitudianl Acoustic) and TA (Transverse Acoustic) branches from phonon band structure?
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Offline kstokbro

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Re: Calculation of group velocity v_LA and v_TA from phonon band structure
« Reply #1 on: June 20, 2014, 15:44 »
We do not have any automatic method, you need to determine the slope of the bandstructure at the gamma point from which the velocity can be derived.
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