- #1
ghegde
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Hi there,
I am trying to understand the dispersion curve(as shown below) of a 1D lattice with diatomic basic.
Here are my questions
1) Can both optical and acoustic branch of phonon can simultaneously exist in crystal?
2)Why there is a band gap between optical and acoustic phonon branch ?
Also please suggest a good book to better understand the crystal physics if your are aware of any.
Thanks in advance for your help,
Ganesh
I am trying to understand the dispersion curve(as shown below) of a 1D lattice with diatomic basic.
Here are my questions
1) Can both optical and acoustic branch of phonon can simultaneously exist in crystal?
2)Why there is a band gap between optical and acoustic phonon branch ?
Also please suggest a good book to better understand the crystal physics if your are aware of any.
Thanks in advance for your help,
Ganesh