1 research outputs found
Wavefronts may move upstream in doped semiconductor superlattices
In weakly coupled, current biased, doped semiconductor superlattices, domain
walls may move upstream against the flow of electrons. For appropriate doping
values, a domain wall separating two electric field domains moves downstream
below a first critical current, it remains stationary between this value and a
second critical current, and it moves upstream above. These conclusions are
reached by using a comparison principle to analyze a discrete drift-diffusion
model, and validated by numerical simulations. Possible experimental
realizations are suggested.Comment: 12 pages, 11 figures, 2-column RevTex, Phys. Rev. E 61, 1 May 200