- #1
Niles
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Hi all
My book says:
"The reason that phonons on a lattice do not carry momentum is that a phonon coordinate (except for wavevector K=0) involves relative coordinates of the atoms".
I can't quite figure this statement out. I understand the words, but I cannot see why it is an explanation.
Can you shed some light on this topic?
Niles.
My book says:
"The reason that phonons on a lattice do not carry momentum is that a phonon coordinate (except for wavevector K=0) involves relative coordinates of the atoms".
I can't quite figure this statement out. I understand the words, but I cannot see why it is an explanation.
Can you shed some light on this topic?
Niles.