Magnetic Ions in Studies of Semiconductor Quantum Well Structures

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...

Theoretical studies of optical transitions in semiconductor quantum structures

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Osmo Vänskä Name of the doctoral dissertation Theoretical studies of optical transitions in semiconductor quantum structures Publisher School of Electrical Engineering Unit Department of Microand Nanosciences Series Aalto University publication series DOCTORAL DISSERTATIONS 214/2014 Field of research Electrophysics Manuscript ...

Magneto-optical studies of dilute nitrides and II-VI diluted magnetic semiconductor quantum structures

Inelastic lifetimes of confined two-component electron systems in semiconductor quantum-wire and quantum-well structures.

We calculate Coulomb scattering lifetimes of electrons in two-subband quantum wires and in double-layer quantum wells by obtaining the quasiparticle self-energy within the framework of the random-phase approximation for the dynamical dielectric function. We show that, in contrast to a single-subband quantum wire, the scattering rate in a two-subband quantum wire contains contributions from both...

Magnetic Semiconductor Quantum Dots

Cdo.5Mno.5S diluted magnetic semiconductor (DMS) quantum dots (QDs) of crystallite size ranging from 24 A to the bulk have been chemically synthesized using an aqueous solution precipitation method and thermal annealing. Subsequent characterization indicates that the "as prepared" material is of the cubic zinc blende structure which evolves with increasing size to the bulk hexagonal wurtzite st...