$negfionizedimpurity

$negfionizedimpurity is the command to setup the related parameters of ionized impurity scattering.
The equation of ionized impurity scattering:

 $W_{imp}(k)=4\pi F(\frac{2k}{\lambda})^{2}[\frac{1}{\sin^2(\frac{\theta}{2})+(\frac{\lambda}{2k})^2}]^{2}$

 $F=\frac{1}{\hbar}[\frac{Ze^{2}}{\epsilon}]^{2}\frac{N_{1D}(E_{k})}{32k^{4}}N_{I}$

$negfionizedimpurity
doping density (S and D)   doping density (channel)   channel-i   channel-f

Example:

$negfionizedimpurity
 1e0  1e24   300   400

In this case we have 681 mesh grids from drain(left) to source(right), and the position of channel is from 300 to 400. The doping concentration for source and drain is $1*10^{24}(1/m^2)$, and that for channel is $1*10^{0}(1/m^2)$.
related commands:

 $ifsolvenegf,  $negfifscattering