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neu
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Homework Statement
I just want to clear this up, I am a little confused:
when an electric field is applied there is a force on the electron K-states thus displacing the fermi surface/sphere
Is the relaxation time ([tex] \tau[/tex])= lifetime of fermi sphere displacement
or is lifetime of displacement= reciprocal relaxation time
both are labebel as [tex]\tau[/tex] in my notes and related as below but how can they be the same?
Homework Equations
[tex] \sigma = \frac{n e^2 \tau}{m}[/tex] electrical conductivity
[tex] \rho = \frac{1}{\sigma}=\frac{m}{n e^2 \tau}[/tex] electrical resistivity
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