$negfionizedimpurity

$negfionizedimpurity is the command to setup the related parameters of ionized impurity scattering. You can also use this function and set the parameter with our GUI version at the input box of "Scattering Parameters" in GUI
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_initial   channel_final

Example:

$negfionizedimpurity
 1.0e0 1.0e24 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