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On the electrnonic life time and el-ph coupling 
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Joined: Thu May 05, 2016 5:18 pm
Posts: 49
University: Rondonia university
Post On the electrnonic life time and el-ph coupling
Dear all,

1- I am in the process of calculating the electronic lifetime (tau) and electron phonon coupling (lambda) for a 2D structure of the form MX2. I am using the electronic k grid crated by EPW (238 points) and converging (tau) w.r.t the q points moving from a qf grif of 30x30x1 to 40x40x1....etc. Since I need one single constant value of (tau), I am calculating the average of tau_{nk} = hbar/ (2 Im \Sigma_{nk}). Tha value I am obtaining is very small something like 3.68471 $\times 10^{-24}$ seconds, which i guess is too small. Is this value reasonale?

2- When calculating both $\lambda$ and $\lambda_{tr}$ for this structure , I am getting 0! The structure is a semi conductor with bandgap ~ 1.5 eV. It makes sense to get small value of $\lambda$ but exactly zero was a bit surprising:


===================================================================
Eliashberg Spectral Function in the Migdal Approximation
===================================================================

lambda : 0.0000000
lambda_tr : 0.0000000


Again, is this reasonable?

Any help or advice would be highly appreciated

Regards

_________________
Physics Department
university of Rondonia Brazil
Porto Velho- Rondonia


Mon Jul 09, 2018 11:09 pm
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