$useschrodn

2D-DDCC solves the Poisson Drift-diffusion self-consistently. If we want to solve Schrodiner equations and get the eigen values, it would be very time consuming. Therefore, there is a special function to get the eigen wave functions and eigen levels in the cross section. Using $useschrodn can achieve this. When this command is used, the program will find top contact's type equal to 2, 21, 22, 7 to solve the problem. Actually this program is design for HEMT or MOSFET devices. The format is

$useschrodn
N_grid Y_top Y_depth Y_interface(Y_int) 

Although 2D solver is based on FEM, when the cross section solver is called, the program solve this problem using FD scheme. Therefore, we need to define Y_top and Y_depth as we used in 1D-DDCC Schrodinger solver to solve this problem. We also need to set N_grid to decide the dy in the FD Schrodinger solver solver. Y_int is for solver to know where is oxide insulator and semiconductor interface. However, this input is no longer used. Therefore, the user can put any value, which will not affect the output.