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A comprehensive theory of couplings between a cavity and different charge configurations in a quantum dot is developed. It is shown that the quantum anti-Zeno effect is essential for the results obtained by QED experiments. The quantum dynamics of the system employing the quantum master equation is analysed. A Stansky-Krastanov InAs QD grown on a GaAs substrate was assumed, and the only first confined...
A microscopic theory is applied to describe nonlinear terahertz excitations of optically-dark excitons in Cu2O. The theory is quantitatively compared to recent experiments. Signatures of Rabi flopping and ponderomotive contributions are discussed and disentangled.
We have used terahertz time-domain spectroscopy to investigate carrier dynamics in a wide range of semiconductors. The technique allows discriminating between free charges and excitons and is perfectly suitable to study carrier-carrier interactions in nanostructured materials.
Sublinear intensity dependence of photoluminescence from organic exciton-polariton microcavities under non-resonant excitation in two power regimes is shown. The sublinearity is attributed to exciton-exciton annihilation, which could compete with polariton-polariton scattering in these devices.
We investigate exciton dynamics in disordered quantum wells with optical two-dimensional Fourier transform spectroscopy (2DFTS). The lack of cross peaks in 2DFTS suggests that excitons localized in spatially separated regions are uncoupled.
We report quantitative spectrally-resolved transient absorption in GaAs quantum wells for varying pump intensity. Comparison to microscopic modeling yields quantitative information about the Coulomb-induced nonlinearities and radiative coupling.
Four-wave mixing in semiconductor quantum wells has long been used to investigate many-particle effects. We introduce the theoretical concepts and illustrate some developments of the field, which D.S. Chemla helped to shape.
Two-quantum coherences in two-dimensional Fourier-transform (2DFT) spectra are attributed to many-body interactions. 2DFT spectroscopy allows two-quantum coherences in semiconductors to be isolated. As a result, many-body coherences can be separated from biexciton coherences.
Studies are presented that combine optical and THz excitation in the linear and nonlinear regimes. The analysis focuses on exciton formation and decay, the plasmonic response, THz gain, excitonic Rabi flopping, and quantum-state control.
We demonstrate that the coherence of the electron spin state, which was transferred from the light polarization state, is tomographically measured in a semiconductor quantum well via the light-hole excitons under in-plane magnetic field by the developed tomographic Kerr rotation method.
Spin flip in a 2D electron gas is realized with a 2 ps, off-resonant laser pulse. Complete spin flip leads to spin precessions that are symmetric with respect to the arrival time of the pi-pulse.
Optical spectra of InAs quantum dot molecules show clear signatures of 2-photon absorption through sequential and simultaneous transitions. Biexcitons can be spatially direct or indirect, producing 2-photon transitions that are unique to molecules.
We show that with sufficient gain, a mixture of two semiconductor quantum dots can produce an isotropic effective dielectric constant that is lossless and negative. This permits small-scale optical mode volume and lossless waveguides.
Phonon-assisted anti-Stokes fluorescence has been observed in GaN film grown on Si (111) substrate. The donor-acceptor pairs and bound excitons have played primary roles in the generation of anti-Stokes fluorescence.
We show that polarization-entangled photon pairs can be obtained deterministically from a semiconductor quantum dot by optically tuning the fine-structure split exciton states into degeneracy.
We have observed blue and red Stark shifts of two excitonic transition peaks in multiple GaN/AlN asymmetric coupled quantum wells due to increases in electric fields originating from spatial separation of photogenerated electrons and holes.
Mechanisms for anti-Stokes photoluminescence observed at room temperature from n-type free-standing GaN grown by MOCVD have been attributed by us to the competition between two-photon absorption and phonon-assisted absorption.
Degenerate four-wave mixing spectrum and the temperature dependence are investigated in a CuCl thin film with high crystalline quality. The signal at room temperature is firstly observed.
We introduce a formalism for describing the quantum dynamics between two spatially-separated quantum dots on-chip, and apply this formalism to demonstrate pronounced entanglement between two quantum-dot excitons separated by distances of 300 mum and more.
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