Microscopic theory of nanostructured laser devices with short-wavelength emission

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A theory for quantum-dot laser systems will be developed to analyze the properties and to guide the optimization of new Nitride-based laser devices which are the subject of projects I.1 and I.2 of this research group. To understand the interplay of nanostructuring and various electronic interaction processes, the application of microscopic models will be necessary. As a central point, the optical gain in quantum-dot systems will be analyzed in comparison to quantum-well systems which have been extensively studied in the past. Optical properties of single quantum dots, studied experimentally in project I.2, are the basis for these investigations. The interplay of carrier injection, electron dynamics in the quantum-confined states, optical gain, and cavity modes of a realistic laser structure will be analyzed to understand the laser emission properties like input-output characteristics and laser threshold, emission spectrum, and dynamical properties. Both, conventional edge-emitters as well as novel vertical-cavity surface-emitting laser structures will be investigated. The theoretical models will directly incorporate results of projects III.1 and III.2.