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Efficiency factor in electron linewidth calculation 
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Joined: Sun Oct 29, 2017 11:04 am
Posts: 1
University: SJTU
Post Efficiency factor in electron linewidth calculation
Dear EPW users,

I read the paper “EPW: Electron–phonon coupling, transport and superconducting properties using maximally localized Wannier functions” which is published on CPC. I found in (8) and (9), you do not include the efficiency factor, which is defined as following

\eta=1-cos\theta_{k,k+q}=1-\frac{v_{k}\cdot v_{k+q}}{v_k^2}

I checked the EPW code in version QE. 6.3 and I found for phonon linewidth, the efficiency factor is added and we can extract the phonon linewidth through the parameter gamma_tr. However, there is no efficiency factor for the electron linewidth calculation. Is this reasonable?

I also checked other papers and I find other papers (PRB 94,155105 (2016) PRB 57, 11276 (1998)) considered the efficiency factor.

Could you give some comments about this issue?



Thank you in advance!



--
Rgds,
Shouhang


Fri May 10, 2019 3:40 am
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