EPW Forum

Dear all,

I am trying to calculate both the electron and hole relaxation times from the imaginary electronic self energy obtained from EPW. I have summed over all energies above the Fermi energy to obtain the electron relaxation time \tau{el} and summed over all valence bands to obtain the hole relaxation time. Is this a correct thing to do?

OBS: In fact I am trying to mimic doping by changing the position of the Fermi level towards both valence and conduction bands.

Elie Moujaes
Federal University of Rondonia
Brazil

Hi,

You can obtain average relaxation time as explained in PHYSICAL REVIEW APPLIED 9, 024019 (2018) by Eqn. A10 for any given band. Otherwise, one should incorporate the information of tau_{n,k} at each point of band structure corresponding to E_{n,k}.

In case, you are trying to incorporate this information to electrical conductivity/tau obtained after solving Boltzmann Transport Eq. under constant scattering time approximation (CSTA),
then one can use average relaxation time for the appropriate bands contributing to transport properties.

Hi can you sen the input. I am also trying the same.

Best