MILLIMETER-WAVE GENERATION BY A SELF-SUSTAINED CURRENT OSCILLATION INAN INGAAS INALAS SUPERLATTICE/

We report millimeter wave generation by a self-sustained current oscil lation in a doped InGaAs/InAlAS wide miniband superlattice. The superl attice (miniband width 160 meV) showed, at room temperature, a current voltage characteristic with negative differential conductance. Couple d to a high-frequency circuit, the superlattice generated millimeter w aves, at a frequency (55 GHz) which was tunable by half a percent by c hanging the bias voltage. The power (0.3 mW) corresponded to an effici ency (i.e., ratio of microwave power to dc power input) of 0.3%. We at tribute the microwave generation to a current oscillation caused by tr aveling dipole domains. (C) 1998 American Institute of Physics. [S0003 -6951(98)02047-6].