NEW TRANSPORT PHENOMENA IN COUPLED QUANTUM-WELLS

Recent studies of bilayer two-dimensional electron systems in GaAs AlGaAs double quantum wells are reviewed. After describing a technique for making separate connections to the individual 2D layers, three classes of experiments will be outlined: "drag" studies of interlayer electron-electron interactions, 2D-2D resonant tunneling experiments, and lastly, a new method for determining the compressibility of the interacting 2D electron gas. As a final example of the new physics afforded by bilayer 2D systems, the recent discovery of a new fractional quantum Hall state, not found in single layer systems, will be discussed. © 1992.