Contributions to Books:
C. Chainais-Hillairet, A. Jüngel, P. Shpartko:
"A finite-volume scheme for a spinorial matrix drift-diffusion model for semiconductors";
in: "ASC Report 03/2015",
issued by: Institute for Analysis and Scientific Computing;
Vienna University of Technology,
An implicit Euler finite-volume scheme for a spinorial matrix drift-diffusion model for semiconductors is analyzed. The model consists of strongly coupled parabolic equations for the electron density matrix or, alternatively, of weakly coupled equations for the charge and spin-vector densities, coupled to the Poisson equation for the electric potential. The equations are solved in a bounded domain with mixed Dirichlet-Neumann boundary conditions. The charge and spin-vector fluxes are approximated by a Scharfetter-Gummel discretization. The main features of the numerical scheme are the preservation of positivity and L1 bounds and the dissipation of the discrete free energy. The existence of a bounded discrete solution and the monotonicity of the discrete free energy are proved. For undoped semiconductor materials, the numerical scheme is uncon-ditionally stable. The fundamental ideas are reformulations using spin-up and spin-down densities and certain projections of the spin-vector density, free energy estimates, and a discrete Moser iteration. Furthermore, numerical simulations of a simple ferromagnetic-layer field-effect transistor in two space dimensions are presented.
Spinor drift-diffusion equations, semiconductors, finite volumes, energy dissipation
Electronic version of the publication:
Created from the Publication Database of the Vienna University of Technology.