In a network of quantum dots embedded in a semiconductor structure, no two are the same, and so their individual and collective properties must be measured after fabrication. Here, we demonstrate a ‘level anti-crossing spectroscopy’ (LACS) technique in which the ladder of orbital energy levels of one quantum dot is used to probe that of a nearby quantum dot. This optics-based technique can be a...

An engineered strain of Stenotrophomonas maltophilia (SMCD1) is capable of the direct extracellular biomineralization of CdS quantum dot nanocrystals from buff ered aqueous solution of cadmium acetate and L-cysteine without the addition of a chemically reactive precursor. Nanocrystal synthesis is strongly influenced by both the Lcysteine/cadmium acetate ratio and pH of the solution. The observe...

Cleaved edge overgrowth and selective area epitaxy were combined for the synthesis of InAs quantum dot (QD) arrays with lateral sizes from 20 to 40 nm. The optical properties were locally assessed by confocal photoluminescence spectroscopy experiments at liquid helium temperature. The emission lines redshift as the lateral size of the QDs is increased. In agreement with a narrow size distributi...

We investigate the electronic transport through a single-level quantum-dot which is capacitively coupled to a charge-qubit. By employing the method of nonequilibrium Green's functions, we calculate the electric current through quantum dot at finite bias voltages. The Green's functions and self-energies of the system are calculated perturbatively and self-consistently to the second order of inte...

Abstract In the present paper hybrid core–shell InP/ZnS quantum dots were prepared by one pot synthesis method which does not require additional component injections and complies more with cost requirements. The synthesized characterized X-ray diffraction optical spectroscopy methods. applicability of particles in inverted solar cells fabricated a step-by-step procedure combines thermal vacuum ...

Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1-xS1-y gradient core-shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell thicknesses was studied. Complementary photoelectrochemical cell measurements were carried out to confirm that the hole injection from the active core through the gradient shell ...

Using spin-density-functional theory, we study the electronic states of a two-dimensional parabolic quantum dot with up to N = 58 electrons. We observe a shell structure for the filling of the dot with electrons. Hund’s rule determines the spin configuration of the ground state, but only up to 22 electrons. At specific N , the ground state is degenerate, and a small elliptical deformation of th...

Semiconductor nanowires (NW) are appealing structures that allow designing quantum structure with unprecedented freedom. With NW, new type of quantum dot (QD) heterostructures (NW-QD) can be directly grown on defined positions without the necessity of self-assembly, as well as more complex structures such as coupled QDs or core-shell structure. However, the quantum confinement requires growing ...

Scalable photonic quantum technologies require on-demand single-photon sources with simultaneously high levels of purity, indistinguishability, and efficiency. These key features, however, have only been demonstrated separately in previous experiments. Here, by s-shell pulsed resonant excitation of a Purcell-enhanced quantum dot-micropillar system, we deterministically generate resonance fluore...

In the current study, linear, nonlinear and total relative refractive index changes of a single shallow hydrogenic donor atom confined in semiconductor core/shell/shell quantum dot heterostructure are investigated detail by compact density matrix formalism. For this purpose, energy eigenvalues corresponding wave functions calculated diagonalization method effective mass approximation. Then, int...