Influence of pulse shape in modulating excitation kinetics of impurity doped quantum dots

Aggregates of Mn2+ Ions in Mesoporous Self-Assembled Cubic ZnS:Mn Quantum Dots: Composition, Localization, Structure, and Magnetic Properties

“…The EPR spectrum of all samples, illustrated in Figure a,b for the cZnS:Mn QDs prepared with 2000 and 20 000 ppm nominal concentration of Mn 2+ ions, respectively, represents a superposition of two sets of six hyperfine component lines each attributed to Mn 2+ ions localized in the core and on the surface of the cZnS:Mn QDs and a broad, featureless line attributed to aggregated Mn 2+ ions. , The set of six narrowest lines, with the smallest hyperfine splitting, belongs to the so-called Mn 2+ (I) centers, consisting of Mn 2+ ions incorporated in the QDs core, at Zn 2+ cation sites localized next to an extended planar defect, a structural model confirmed and employed in further experimental and theoretical investigations. − The other set of well resolved six broader lines, with a larger hyperfine splitting, belongs to isolated Mn 2+ ions localized on the surface layer of the QDs . The broader lines reflect the increased disorder of the cZnS QD outer layer hosting the Mn 2+ ion, containing in its structure either adsorbed molecule species (H 2 O, O 2 , ...), or capping molecules added to stabilize the QDs and improve their properties for various applications …”

Additive Gaussian white noise modulated excitation kinetics of impurity doped quantum dots: Role of confinement sources

“…It needs to be mentioned that the present work and the work published in reference [64] are widely different and they are in no way close. Both the works focus on the same phenomenon i.e.…”

“…In complete contrast to previous pulsed field [64], the white noise is a random perturbation with special features of zero mean and negligible correlation time. The present work also critically explores the roles played by the confinement potential (ω 0 ), the cyclotron frequency (ω c ), their ratio (ω r ), dopant location (r 0 ) and becomes a self-contained independent investigation.…”

Two-electron quantum ring in short pulses

“…Pulse shape effects on the dynamics of quantum heterostructures have recently been studied. [53] The square, sine-square, and secant-hyperbolic pulses are of quite some importance in manipulating the optical response of such a system. These pulses are now available experimentally.…”