Scheuerer, Roland and Renk, Karl Friedrich and Schomburg, Ekkehard and Wegscheider, Werner and Bichler, Max
Nonlinear superlattice transport limited by Joule heating.
Journal of Applied Physics 92 (10), pp. 6043-6046.
We studied the effects caused by Joule heating in GaAs/AlAs superlattices. We measured the current–voltage characteristics of superlattice mesas of different cross sections. Each current–voltage characteristic showed a corresponding peak current followed by a region of negative differential conductivity, according to miniband transport in the superlattice. We found that Joule heating in the mesa reduced the peak-current density. Current jumps in the region of negative differential conductivity disappeared for large cross-section mesas indicating a suppression of electron domains. The results are of significance for the development of high-power superlattice oscillators for submillimeter radiation.