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Number of modes for a 2d crystal 
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#1
Apr414, 06:54 AM

P: 16

Hi, I have problems with the following:
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 


#2
Apr514, 01:56 PM

Sci Advisor
P: 3,593

Yes, both conclusions seem to be correct to me.



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