Posted by Will S on May 30, 2013, 7:25 pm
I am doing the second question on 2006 paper and got stuck with showing the average phonon energy at low T is a linear function of temperature. So the average phonon energy = total energy (i.e. the expression we differentiate to find heat capacity) divided by the total number of phonons? total number of phonons is integral of g(omega) x bose factor Is that right? I'm a bit confused as I am not getting the right T dependence and also there is the zero point energy in the total energy? I think I'm doing it wrong. Is that the right expression for the total number of phonons? Thanks 
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