Then we couple the von Neumann equation self-consistently with the Poisson equation to describe interactions between electrons. For this both a Gummel method and a full Newton solver have been implemented. The assembly of the Jacobian matrix needed for the Newton solver has been parallelized using MPI. It has been observed that the system admits multiple solutions which are difficult to handle with stationary simulations alone.

The final section discusses the description of scattering within the QTBM. We use the hydrodynamical formulation to investigate scattering models which are compared with the Wigner relaxation time model.

- 7.2.1 Separation of Neumann Equation
- 7.2.2 Open System
- 7.2.3 Self Consistency
- 7.2.4 A Brute Force Approach: Parallelization with MPI
- 7.2.5 Existence But Non-Uniqueness
- 7.2.6 Scattering in the QTBM

R. Kosik: Numerical Challenges on the Road to NanoTCAD