141 citations · 260 across the 4 of their papers we have counts for
4 papers
High-Frequency Impedance of Driven Superlattices
A. -K. Jappsen, A. Amann, A. Wacker +2
The complex impedance of a semiconductor superlattice biased into the regime of negative differential conductivity and driven by an additional GHz ac voltage is computed. From a si…
Wavefronts may move upstream in doped semiconductor superlattices
A. Carpio, L. L. Bonilla, A. Wacker +1
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 sep…
Electrically tunable GHz oscillations in doped GaAs-AlAs superlattices
J. Kastrup, R. Hey, K. H. Ploog +5
Tunable oscillatory modes of electric-field domains in doped semiconductor superlattices are reported. The experimental investigations demonstrate the realization of tunable, GHz f…
Current-voltage characteristic and stability in resonant-tunneling n-doped semiconductor superlattices
A. Wacker, M. Moscoso, M. Kindelan +1
We review the occurrence of electric-field domains in doped superlattices within a discrete drift model. A complete analysis of the construction and stability of stationary field p…