檢視 $usespecgen 的原始碼

$usespecgen is the command to put a generation profile with a specific function, which is mostly a Gaussian shape generation profile.

 $usespecgen
 N_region
 func_type, A, P1, P2 , P3, P4, P5, P6, P7
 1 A <math>\hbar\omega</math> <math>\sigma_{x}~ \sigma_{y}</math> xc yc
 2 A <math>\hbar\omega</math> <math>\sigma_{x}~ \sigma_{y}</math> xc yc
 3 A <math>\hbar\omega</math> <math>\sigma_{x}~ \sigma_{y}</math> xc yc
 4 A <math>\hbar\omega</math> <math>\sigma_{y}</math> yc
 5 A <math>\hbar\omega</math> <math>\sigma_{x}</math> xc 

<math>\hbar\omega</math> is the phonon energy of light source. If <math>\hbar\omega > Eg</math>, the generation rate will be activated.  

For the function types: 
 1: If <math>\hbar\omega > Eg</math>, <math> G(x,y) = A * exp\left(-\frac{(x-xc)^{2}}{2*\sigma_{x}^{2}}\right) * exp\left(-\frac{(y-yc)^{2}}{2*\sigma_{y}^{2}} \right)  </math>
 2: If <math>\hbar\omega > Eg</math>, <math> G(x,y) = A * exp\left(-\frac{(x-xc)^{2}}{\sigma_{x}^{2}}\right) * exp\left(-\frac{|(y-yc)|}{\sigma_{y}} \right)  </math>
 3: If <math>\hbar\omega > Eg</math>, <math> G(x,y) = A * exp\left(-\frac{(y-yc)^{2}}{\sigma_{y}^{2}}\right) * exp\left(-\frac{|(x-xc)|}{\sigma_{x}} \right)  </math>
 4: If <math>\hbar\omega > Eg</math>, <math> G(x,y) = A * exp\left(-\frac{-|(y-yc)|}{\sigma_{y}}\right)  </math>
 5: If <math>\hbar\omega > Eg</math>, <math> G(x,y) = A * exp\left(-\frac{-|(x-xc)|}{\sigma_{x}}\right)  </math>