Phys. Rev. B 62, 2786–2796 (2000)Microscopic derivation of transport coefficients and boundary conditions in discrete drift-diffusion models of weakly coupled superlatticesReceived 29 September 1999; revised 2 February 2000; published in the issue dated 15 July 2000 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 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. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.2786
DOI:
10.1103/PhysRevB.62.2786
PACS:
72.20.Ht, 73.50.Fq, 73.40.-c
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