[Pw_forum] the unit of lambda

[Guoying Gao]

Hi Eyvaz,
     Thanks for your kindly help.
     I have read some related papers. But I didn't find the reason.
Could you recommend me some papers?
Thanks again.
Guoying

National lab of superhard materials
Jilin University
P.R. of China

On Dec 25, 2007 6:53 PM, Eyvaz Isaev <eyvaz_isaev at yahoo.com> wrote:
> Dear Guoying,
>
> Merry Christmas, thanks!
>
> Electron phonon coupling constant \lambda is a
> dimensionless parameter by its definition.
> At low temperatures (T) experimental electronic
> specific heat C_{el}(T) is defined as
> C_{el}(T) = const N(0) (1 + \lambda) T, where N(0) is
> taken from electronic structure calculations (i.e.
> N(0) is the DOS at the Fermi level). Thus, \lambda can
> be considered as a measure of the enhancement of the
> electronic heat due to electron - phonon interacton.
>
>
> > However, a question confused me for a long  time,
> > that is, there is  no unit for the electron pnonon
> > coupling parameter  lambda.
>
> I suggest, the best way is reading a textbook or
> related papers to be not confused.
>
> Please do not forget provide your affiliation.
>
> Bests,
> Eyvaz.
>
>
> --- Guoying Gao <gaoguoying at gmail.com> wrote:
>
> > Dear pwscf users,
> >
> >          I have done electron-phonon coupling
> > calculations for a
> > period. However, a question confused me for a long
> > time, that is,
> > there is
> > no unit for the electron pnonon coupling parameter
> > lambda. Does anyone
> > know the reason for this? Any help will be
> > appreciated.
> >
> > Merry Christmas!
> >
> > Guoying
> > _______________________________________________
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> >
>
>
> -------------------------------------------------------------------
> Prof. Eyvaz Isaev,
> Theoretical Physics Department, Moscow State Institute of Steel & Alloys, Russia, and
> Condensed Matter Theory Group, Uppsala University, Sweden
> Eyvaz.Isaev at fysik.uu.se, eyvaz_isaev at yahoo.com
>
>
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