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We observed nutation in the time-resolved photoluminescence signals from resonantly coupled ZnO double-quantum-well structures via optical near-field energy transfer, in which the period of the nutation was determined to be 550 ps.
Coherent Zeeman resonance from electron spin coherence is demonstrated in a Lambda-type three-level system, coupling electron spin states via trions. The use of a mixed-type quantum well allows the optical control of electron densities.
The optical properties of coupled excitons are examined for bi-layer quantum dots by the single-dot photoluminescence excitation (PLE) spectroscopy. A clear guideline for detecting coupled excitons is provided with PL and PLE spectra.
Low temperature, polarization-resolved, magneto-photoluminescence studies of individual CdSe nanocrystals reveal a Zeeman splitting of spin-up and spin-down excitons in a subset of nanocrystals that have their wurzite-c axes aligned parallel to the applied field.
We observed highly non-thermal features from the photoluminescence of InGaAs/GaAs quantum dots in a planar microcavity. The effect was interpreted in terms of the interplay of phonon relaxation and cavity-dependent excitonic radiative recombination.
The electronic temperatures, the lattice temperature and the electron-lattice energy relaxation rate in bound-to-continuum THz quantum-cascade lasers are extracted from the analysis of micro-probe photoluminescence spectra and compared with results for resonant-phonon structures.
We present a comprehensive many-particle theory for optical refrigeration of bulk GaAs via luminescence up-conversion. We predict cooling in the regime of a partially ionized exciton gas and discuss its temperature dependence.
We measured the correlation between the two excitons in the coupled quantum dots by the photoluminescence using two color synchronously-locked pico-second lasers and observed unique correlation phenomena when both excitons are excited simultaneously.
Ultrathin films of cyanine dye J-aggregates show extraordinary exciton cross sections. Exciton dynamics are studied by ultrafast pump-probe and transient photoluminescence spectroscopy. An exciton delocalization length of N=18 monomers was measured at room temperature.
Control of the dynamic nuclear polarization is achieved in individual InGaAs dots embedded in a p-i-n diode by employing the vertical electric field controlling carrier tunneling rates. Nuclear magnetic fields up to 1.7 T are observed.
One- and two-photon luminescence excitation spectra, showing a series of excitonic states, are compared to ab-initio calculations to unravel binding energies, symmetries and spatial extent of excitonic wavefunctions in single-walled carbon nanotubes.
We present a microscopic theory of polariton photoluminescence in J-aggregate microcavities including the effects of phonons and disorder. We demonstrate a phonon-assisted coupling of the upper and lower polariton modes and compare to experiment.
Polarisation-entangled photon pairs are generated from single InAs quantum dots. This is achieved by restoring the degeneracy of the exciton level with an in-plane magnetic field or by careful selection of the dot.
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