We know that It is possible to calculate

**energy dependent electron and hole relaxation time**using the EPW code.

Now, I was wondering how we can

**approximate the constant relaxation time**from this data, that can be used in other calculations (for example, electronic contribution to thermal conductivity).

A

**straightforward average over an energy window**can be an option. But, since only electrons with energies close to the Fermi level contribute to transport,

**the choice of energy window seems to be important**. Besides, the

**weight of the contribution of electrons with different energies can be different.**

In this regard, could you please suggest some

**methods to approximate the constant relaxation time of electrons/holes**systematically from the output of EPW?

Thanks,

Muhammad Aminul Haque

Department of Electrical and Electronic Engineering

University of Dhaka, Bangladesh