Magnetic Field Induced Charge Instabilities in Weakly Coupled Superlattices

Details Magnetic Field Induced Charge Instabilities in Weakly Coupled Superlattices Magnetic Field Induced Charge Instabilities in Weakly Coupled Superlattices

1998-03-03

arxiv.org/abs/cond-mat/9803039v1

Physics

Condensed Matter

5 pages, 4 postscript figures

Scientific paper

10.1016/S0921-4526(98)00539-0

Using a time dependent selfconsistent model for vertical sequential tunneling,we study the appearance of charge instabilities that lead to the formation of electric field domains in a weakly coupled doped superlattice in the presence of high magnetic fields parallel to the transport direction. The interplay between the high non linearity of the system --coming from the Coulomb interaction-- and the inter-Landau-level scattering at the domain walls (regions of charge accumulation inside the superlattice) gives rise to new unstable negative differential conductance regions and extra stable branches in the sawtooth-like I-V curves.

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