The spontaneous emission rate of excitons strongly confined in quantum dots (QDs) is proportional to the overlap integral of electron and hole envelope wave functions. A common and intuitive interpretation of this result is that the spontaneous emission rate is proportional to the probability that the electron and the hole are located at the same point or region in space, i.e., they must coinci...

The diffusion of charged heavy particles in metals is discussed by the method of the density matrix, extending the Kagan-Klinger theory to include electron· particle interaction. This method can be applied to both cases of band·like and hopping-like diffusions. The diffusion of the particles at low temperatures is determined by electron-particle scattering and the overlap integral between two e...