K. Kowalik

Manipulating exciton fine structure in quantum dots with a lateral electric field

The fine structure of the neutral exciton in a single self-assembled InGaAs quantum dot is investigated under the effect of a lateral electric field. Stark shifts up to 1.5 meV, an increase in linewidth, and a decrease in photoluminescence intensity were observed due to the electric field. The authors show that the lateral electric field strongly affects the exciton fine-structure splitting due to active manipulation of the single particle wave functions. Remarkably, the splitting can be tuned over large values and through zero.

Influence of an in-plane electric field on exciton fine structure in InAs-GaAs self-assembled quantum dots

The influence of an in-plane electric field on the optical properties of single quantum dots is investigated. On a sample containing a plane of InAs∕GaAs dots, micrometer-size electro-optical structures were produced in order to apply an external electric field in the dot plane. A large decrease of the anisotropic exchange splitting, correlated with the in-plane Stark shift, is observed.

Excitation mechanisms of individual Cd Te ∕ Zn Te quantum dots studied by photon correlation spectroscopy

Systematic measurements of auto- and cross-correlations of photons emitted from individual

Dynamic nuclear polarization of a single charge-tunable InAs/GaAs quantum dot

\mathrm{Cd}\mathrm{Te}∕\mathrm{Zn}\mathrm{Te}

Optical alignment and polarization conversion of the neutral-exciton spin in individual In As ∕ Ga As quantum dots

quantum dots under pulsed excitation were used to elucidate nonresonant excitation mechanisms in this self-assembled system. Memory effects extending over a few excitation pulses have been detected in agreement with previous reports and quantitatively described by a rate equation model, fitting a complete set of correlation and PL intensity results. The important role of single carrier trapping in the quantum dot was established. An explanation was suggested for the unusually wide antibunching dip observed previously in

Monitoring electrically driven cancellation of exciton fine structure in a semiconductor quantum dot by optical orientation

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Single-spin optical read-out in CdTe/ZnTe quantum dot studied by photon correlation spectroscopy

autocorrelation experiments on quantum dots under cw excitation.

In-plane optical anisotropy of parabolic and half-parabolic Cd1−xMnxTe quantum wells

We report on the dynamic nuclear polarization of a single charge-tunable self-assembled InAs/GaAs quantum dot in a longitudinal magnetic field of

Fabrication and micro-photoluminescence study of CdMnTe diluted magnetic quantum dots

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Enhancement of the spin gap in fully occupied two-dimensional Landau levels

0.2T. The hyperfine interaction between the optically oriented electron and nuclei spins leads to the polarization of the quantum dot nuclei measured by the Overhauser-shift of the singly-charged excitons (