Binding energies of excitons in II–VI compound-semiconductor based quantum well structures

Correlation versus mean - field contributions to excitons , multi - excitons , and charging energies in semiconductor quantum dots

Single-dot spectroscopy is now able to resolve the energies of excitons, multi-excitons, and charging of semiconductor quantum dots with . 1 meV resolution. We discuss the physical content of these energies and show how they can be calculated via QuantumMonte Carlo (QMC) and Configuration Interaction (CI) methods. The spectroscopic energies have three pieces: (i) a “perturbative part” reflectin...

Binding Energies and Capture of Electrons, Holes and Excitons on Quantum Well Interface Defects

Exciton condensate in semiconductor quantum well structures.

We propose that the exciton condensate may form in a well-controlled way in appropriately arranged semiconductor quantum well structures. The mean-field theory of Keldysh and Kopaev, exact in both the high density and the low density limits, is solved numerically to illustrate our proposal. The electron-hole pairing gap and the excitation spectrum of the exciton condensate are obtained. The ene...

Quantum Well Excitons in Semiconductor Microcavities: Uniied Treatment of Weak and Strong Coupling Regimes

The system of one or several quantum wells embedded in a pla-nar semiconductor Fabry-P erot microcavity with distributed Bragg reeectors is studied in the framework of both a semiclassical and a full quantum theory. The results obtained with the two treatments are proved to be equivalent. Simple analytical expressions for the exciton-radiation mixed mode energies are obtained. In particular the...

Impurity binding energies in semiconductor Fibonacci superlattices

We have calculated the density of states (DOS) of a GaAs–GaAl superlattice whose ratio between the potential energy of the impurities and the potential energy of the atoms at the lattice is a nth power of the golden mean t 1⁄4 ð1 þ ffiffi 5 p Þ=2; ðn 1⁄4 1; 2; 3;...Þ: Our theory uses Dyson’s equation together with a transfer-matrix treatment, within the tight-binding Hamiltonian model. The elec...