Transition probability clarification

[Vahid]

Dear EPW Community,

In transport.f90, the transition probability is defined as

Code: Select all

 
! transition probability
! (2 pi/hbar) * (k+q-point weight) * g2 *
! { [f(E_k+q) + n(w_q)] * delta[E_k - E_k+q + w_q] +
!   [1 - f(E_k+q) + n(w_q)] * delta[E_k - E_k+q - w_q] }

The first term is absorption (+w_q) and the second term is emission (-w_q).

However, in Eq. 3 in PRB76, 165108, 2007, the first term in the delta function is emission and the second term is absorption.

Is there a convention difference between the EPW code and the PRB76 paper?

Thanks,
Vahid

Vahid Askarpour
Department of physics and atmospheric science
Dalhousie University
Halifax, Canada

[hlee]

Dear Vahid Askarpour:

I think the expression used in transport.f90 is correct.
You can check other literatures, for instance, Eq. (170) of the paper at https://journals.aps.org/rmp/pdf/10.110 ... .89.015003 .

Sincerely,

H. Lee