Physics – Condensed Matter
Scientific paper
1997-07-23
Phys. Rev. B 55, 2476 (1997)
Physics
Condensed Matter
Tex file (20 pages) and 16 postscript figures
Scientific paper
10.1103/PhysRevB.55.2476
Tunable oscillatory modes of electric-field domains in doped semiconductor superlattices are reported. The experimental investigations demonstrate the realization of tunable, GHz frequencies in GaAs-AlAs superlattices covering the temperature region from 5 to 300 K. The orgin of the tunable oscillatory modes is determined using an analytical and a numerical modeling of the dynamics of domain formation. Three different oscillatory modes are found. Their presence depends on the actual shape of the drift velocity curve, the doping density, the boundary condition, and the length of the superlattice. For most bias regions, the self-sustained oscillations are due to the formation, motion, and recycling of the domain boundary inside the superlattice. For some biases, the strengths of the low and high field domain change periodically in time with the domain boundary being pinned within a few quantum wells. The dependency of the frequency on the coupling leads to the prediction of a new type of tunable GHz oscillator based on semiconductor superlattices.
Bonilla Luis L.
Grahn Holger T.
Hey Richard
Kastrup J.
Kindelan Manuel
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