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The time dependent response of spin diffusion to light stimulation in a realistic lateral structure, which leads to a simple spintronics-based scheme for the electrical measurement of circular light polarization is investigated. The results imply that spin accumulation in short channels could be tracked in time with relatively high time resolution when the Schottky barriers and the geometry are designed properly.

We describe a theoretical model for the linear optical gain properties of a quantum wire assembly and compare it to the well known case of a quantum dot assembly. We also present a technique to analyze the gain of an optical amplifier using bias dependent room temperature amplified spontaneous emission spectra. Employing this procedure in conjunction with the theoretical gain model, we demonstrate that InAs/InP quantum dash structures have quantum-wire-like characteristics. The procedure was used to extract the net gain coefficient, the differential gain, and the relative current component contributing to radiative recombination. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

An experiment was conducted to study the temperature dependence of the coupling between n-type delta-doping regions. It was demonstrated that at room temperature the main coupling mechanism between an n-type delta-doping region and an adjacent plane of dots is energy-conserving electron-electron scattering, in which a hot electron in the delta-doping region transfers energy to a deeply confined electron in that region and relaxes to the quantum dot.