: The exciton binding energy of an asymmetrical GaAs-Ga1-xAlxAs cylindrical quantum dot is studied with the use of the effective mass approximation and a variational calculation procedure. The influence on this quantity of the application of a direct-current electric field along the growth direction of the cylinder, together with that of an intense laser field, is particularly considered. The r...

Photoluminescence ~PL! kinetics of long-lifetime indirect excitons in a GaAs/AlxGa12xAs coupled quantum well characterized by a small in-plane random potential was studied at temperatures 1.5<T<15 K for a wide range of exciton densities. Strong deviations of the indirect exciton PL kinetics from monoexponential PL rise/decay were observed at low temperatures and high exciton densities. In parti...

The possibility of the formation an electron-hole liquid in type II heterostructures based on monolayers (bilayers) transition metal dichalcogenides is considered. It indicated that additional valleys conduction band, which are present bilayers, required for its observation. binding energy interlayer exciton found by variation method. An analytical formula shape recombination line liquid.

linear–dendrite copolymers containing hyper branched poly(citric acid) and linear poly(ethylene glycol) blocks pca–peg–pca are promising nonmaterial to use  in nanomedicine. to investigate their potential application in biological systems (especially for drug carries) oniom2 calculations were applied to study the nature of particular interactions between drug and the polymeric nanoparticles.  b...

INTRODUCTION............................................................................ 59 Exciton Migration ............................................................................ 59 Energy Dissipation ............................................................................ 59 Pigment-Protein Complexes ............................................................................ 59 CO...

8H-SiC epilayers grown on small 8H-SiC Lely platelets are investigated optically using photoluminescence spectroscopy. At low temperature the near band gap emission detected in the 2.78 to 2.67 eV range contains sharp lines associated to nitrogen-bound-exciton recombination. Three different no-phonon lines are detected accompanied by their phonon replicas. Free-exciton replicas are also observe...