Microscopic derivation of transport coefficients and boundary conditions in discrete drift-diffusion models of weakly coupled superlattices

Details Microscopic derivation of transport coefficients and boundary conditions in discrete drift-diffusion models of weakly coupled superlattices Microscopic derivation of transport coefficients and boundary conditions in discrete drift-diffusion models of weakly coupled superlattices

1999-09-30

arxiv.org/abs/cond-mat/9909449v2

Phys. Rev. B 62, 2786-2796 (2000).

Physics

Condensed Matter

11 pages, two-column Revtex, 6 figures, new Appendix and figures, corrected some typos

Scientific paper

10.1103/PhysRevB.62.2786

A discrete drift-diffusion model is derived from a microscopic sequential tunneling model of charge transport in weakly coupled superlattices provided temperatures are low or high enough. Realistic transport coefficients and novel contact current--field characteristic curves are calculated from microscopic expressions, knowing the design parameters of the superlattice. Boundary conditions clarify when possible self-sustained oscillations of the current are due to monopole or dipole recycling.

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