[Pw_forum] electron-phonon coupling

[Massimiliano Bonomi]

Dear users,
I'm calculating electron-phonon coupling for a solid assembled by
cluster. In order to get lambda with espresso package i have to
calculate lambda(q) for a regular q-grid and then make a summation
(using lambda.x).

In case of a very very flat phonon dispersion curve, do you think i can
approximate lambda as a constant as a function of q, in order to get an
extimate of lambda only evaluating it at Gamma point??

Thanks in advance.
Massimiliano Bonomi.
-- 
Massimiliano Bonomi
Dipartimento di Fisica, Università degli Studi di Milano 
via Celoria, 16 - 20133 Milano, Italy
ph. +39 02 50317 717
e-mail: massimiliano.bonomi at mi.infn.it, massimiliano.bonomi at unimi.it