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[Geoffrey Stenuit <geoffrey.stenuit@tyndall.ie>]

Xiao Deng wrote:

> Dear abinit user,
>  
>       I want to get the effective mass of the electrons and holes. Can 
> anybody give me some advice? Thanks!
>  
> Xiao Deng

Dear Xiao Deng,

An easy way to get the effective mass is simply to compute the energy 
dispersion in the vicinity of the k-point where you would like to 
calculate the mass (See the abinit tutorial, lesson 3 for more details 
about the computation of the band structure). Using the relation,
$E(k)=\frac{\hbar^2k^2}{2m^*}$,
you then need to fit the energy dispersion with a quadratic law 
$E(k)=Ck^2$, the quadratic coefficient C being inversely proportional to 
the effective mass.

Good luck,

Joe