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Quantum diffusion,
optical decay and thermalization of indirect
excitons in coupled quantum wells
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Resonant acousto-optics
of quantum well excitons and microcavity polaritons
Scattering of polaritons by a coherent acoustic
wave is mediated and strongly enhanced by the
excitonic states resonant with the acoustic
and optic fields in the intraband and interband
transitions, respectively. Both resonant interactions,
the exciton-photon coupling and the interaction
of excitons with the acoustic pump wave, should
be treated non perturbatively (strong coupling
regime) and on an equal basis.
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Exciton dephasing in
quantum dots |
| It is widely believed that,
due to its discrete nature, excitonic states
in a quantum dot coupled to dispersionless longitudinal-optical
(LO) phonons form everlasting mixed states (exciton
polarons) showing no line broadening in the
spectrum. This is indeed true if the model is
restricted to a limited number of excitonic
states in a quantum dot. We show, however, that
extending the model to a large number of states
results in LO phonon-induced spectral broadening
and complete decoherence of the optical response.
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Semiconductor solitons
and polaritonic photonic crystals
Semiconductor
materials support the propagation of solitary
waves (solitons)
which may have very different properties from
conventional Kerr solitons
supported, for instance, by optical fibers.
This is due to many-body effects that come into
play in semiconductors. Also the presence of
several kind of
quasiparticles, such as excitons and polaritons,
strongly affects the linear and nonlinear propagation
of intense light pulses. One of our aims is
to analyze this influence in Polaritonic Photonic
Crystals (PPCs), i.e. conventional photonic
crystals made with polariton materials.
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