Hi, I have problems with the following:(adsbygoogle = window.adsbygoogle || []).push({});

Number of modes for a 2d crystal with one atom per primittive unit cell.

1. Number of discrete vibrational modes?

Should there be 2N of them? That is what I come up with if I think of one transverse and one longitudinal mode for each k. But I am unsure.

2. So am I able to obtain two branches from this crystal?

Both of them are acoustical?

Thank you :D

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# Number of modes for a 2d crystal

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