Optics on atomically precise quantum dot systems fabricated by cleaved edge overgrowth

Summary form only given. The optical properties of different quantum dot structures consisting of individual dots and pairs of coupled dots have been studied experimentally. The 7/spl times/7/spl times/7 nm/sup 3/ size GaAs quantum dots form at the intersection of three orthogonal quantum wells fabricated by two-fold application of the cleaved edge over-growth method. The high degree of control over shape, composition and position of the dots, achievable by this technique, allows a detailed investigation of the influence of coupling between zero-dimensional objects. In this way an artificial molecule can be assembled from two of such artificial atoms.