Hi! How exactly is the relationship between number of atoms in the basis of a bravais lattice, and the number of possible phonon modes?(adsbygoogle = window.adsbygoogle || []).push({});

So, for example, if you have 2 atoms in a basis you get 3 acoustical and 3 optical modes in 3 Dimensions. But why exactly is this? Do you need to set up the equations of motion of such a lattice system to find out?

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# Number of phonon modes possible

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