electron and hole relaxation times

[eliephys78]

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

[Gautam Sharma Monty]

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.

[dprai1985]

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

Best