$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
NdSD NdC Channeli Channelf

Example:

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

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