[Pw_forum] problem with field

[pari shok]

Dear All,
I am trying to study the impact of the electric field on an additional
electron at the interface of Si/SiO2 structures.
I used different field amplitudes, from 0.002 a.u. to 0.01.
I used the sawtooth potential that changes the slope in the middle of SiO2.
My concern is that neither the wavefunction, nor the internal total
potential of the structure does not show the effect of that strong
field.
I was wondering whether anybody has any suggestion for me to improve
my calculations.
Thank you in advance.
P Shok